Trekking in the Crater Highlands of the Rift Valley in Tanzania, Summer 2011

Total Page:16

File Type:pdf, Size:1020Kb

Trekking in the Crater Highlands of the Rift Valley in Tanzania, Summer 2011 Crater Highlands, Rift Valley, Tanzania Summer 2011 p.1 Trekking in the Crater Highlands of the Rift Valley in Tanzania, Summer 2011 The Rift Valley is a peculiar region in Eastern Africa, which has been formed through extensive tectonic and volcanic activities and today is characterized by a chain of extinct and on active volcanoes (http://en.wikipedia.org/wiki/Rift_Valley_lakes). The wonders of Ngorongoro Crater National Park are as much part of this region as are Empakaii Crater or the active volcano Ol Doinyo Lengai. To a large extent, this region is protected by assigning it either the status of National Park or of Conservation Area. Large parts of the area are traditionally inhabited by the Massai, which are a mainly nomadic tribe and live of their life stock as well as of some small agriculture. The conflict between the protection of nature, and the preservation of the wonders of the Rift Valley for future generations (and the European, American and Asian Tourists), and the requirements of the native population for survival, are exemplary in this area and will be mentioned later in this report. The Crater Highlands have been the area of a five-day trekking tour, which has been organized through the “Cultural Tourism Program” (http://www.tanzaniaculturaltourism.com/) in the town of Mto wa Mbu (http://mtoculturalprogramme.tripod.com/). I was introduced to the Cultural Tourism Program in 2010 by Emmanuel Msamba, who at that time took care of me while I did some teaching at KatSec in Karatu (for further infos, see reports on http://www.bonebiology.dkf.unibe.ch/), Tanzania. We made some bicycle tours in the Lake Manyara Conservation Area with the guide Abraham Thomas (whom you will meet again called Ibra), with whom we had some marvelous encounters with African wild life as has been described previously. End of 2010, I did contact Ibra and he and his colleagues organized a wonderful trekking tour through the Crater Highlands, the description of which will be the topic of this report. THE TOUR The trekking tour has been taking place in the Crater Highlands of the Rift Valley. It started on Saturday, August 13, 2011 and lasted until Wednesday, August 17. The major points that were visited during the hikes are shown on the map: - Visit of Olmoti Crater, passing through the Embulmbul depression and camping at Bulati; - Walking to Empakaii Crater, hiking down to the crater lake and camping on the rim, making for a max of altitude meters (how Matthias, my son, mentioned this year during a hike on the Schrattenfluh: “what is hard to gain and then to get rid of? Altitude during a hike.” - Hiking through Naiyobi Village to a forest of Yellow Acacia. - Descending down to the Rift Valley, through a desert area of unique beauty to the base of Ol Doinyo Lengai. Transfer to a camp site close to Lake Natron. - Climbing of Ol Doinyo Lengai (The Mountain of God for the Massai) during night and returning back to Mto Wa Mbu and Karatu. Crater Highlands, Rift Valley, Tanzania Summer 2011 p.2 Day 1 On the first day, we’ve been moving from Karatu to Nainokanoka in the Ngorongoro Conservation Area. There we’ve been picking up Joshua, who will be our guide for the next 48 hours. Our first goal was Olmoti Crater, a crater just going down (left). Lots of water, rain forest. While it was quite easy walking, there were some most interesting discussions with Joshua on the situation of the Massai in modern Tanzania and in the Conservation Area. Good talks, but worlds apart. After Olmoti Crater, we’ve moved on and we wandered through the Embulmbul Depression (right). A characteristic for Embulmbul Depression is the side by side living of wild life and men with life stock. You mainly have low intensity agriculture with sheep and cattle, and some small villages. No vegetables though, to protect nature, the Massai are not supposed to grow vegetables on their land, this making life not easier for them. What does a Westerner think? Since 2 years, the Massai are not allowed to grow vegetables for their own consumption. Western Conservation Agencies’ demands, Tanzanian Government’s compliance. For the Government, there are two aims to be considered; (i) get the money, (ii) change the nomadic life style of the Massai and make them to settle outside their homelands. In late afternoon, we did arrive at Bulati, the site of our first camping night. The luggage was already there, and we met Abdul, the cook and the driver with the donkeys. Bulati Village, a conglomerate of villages in the Conservation Area. A conglomerate of villages – but just one tree (right). And in Bulati, we completed our team for the following days: Abdul the cook and the men who was responsible for the donkeys. Thus, the team for the coming few days was complete and I’ve been looking forward to the things coming. Day 2 After a hearty dinner, a good night’s sleep and breakfast, we have been Abdul the cook & magician Ibra (right) and Stanley on our way to Empakaii Crater. In the with the fire. (center), the guides, and the afternoon, we descended into the Man with the Donkeys (left). Crater in search of Leopards. The question of course – you want to see them or you don’t want to see them? Anyway, none seen – but it’s been raining. RAINING. … and it never rains in Africa – say Toto. Our camp for the night has been set up on the rim of the Crater to protect the fragile ecosystem down there. During the night, we got some visits Crater Highlands, Rift Valley, Tanzania Summer 2011 p.3 from Buffalos, I just heard them, didn’t know what the noise was from, but it probably hadn’t changed my reaction anyway – play death … The lake in Empakaii Crater. Very rich in minerals, but, no flamingos, this not being the season. The shores of Lake Empakaii are very soft, the white stuff being salt. Day 3 We are leaving Ngorongoro Conservation Area and Joshua is leaving our group. With him, a friend of 2 days is leaving. Insightful discussions, glimpses into another world. We went on and reached the Massai Village of Naiyobi (= cold place). From there, we went on to the Yellow Acacia forest (left). The area is exceedingly beautiful, the weather was very nice and again, we had a great campsite and – great dinner. Dinner, drink, campfire, cold night, discussions, what a great time I had the privilege to spend. After arrival in the afternoon I did go for some short walk onto a ridge – and there, the first real view of The Mountain, Ol Doinyo Lengai. This is where we seem to want to go. If it is not the way, that is the aim, this will really be the aim. Day 4 We spent the day walking through a spectacular desert area, called Impala’s Horn. Really awesome, we did have a great time. Impala’s Horn The guides, Ibra & Stanley The Food and the Kitchen For almost the whole day, the mountain was visible. Of course, my thoughts were circulating around my wish to go up there, and how to get down again. By the way, the grey sand is of course from the eruptions of Ol Doinyo Lengai, the only active volcano world wide that spouts Carbonatite lava. Crater Highlands, Rift Valley, Tanzania Summer 2011 p.4 And this is Ol Doinyo Lengai. Tonight we’ll go and climb it. Here, the donkeys left us, from here we did go to a Lake Natron Camp Site to catch a few hours sleep (sleep?), to relax and to prepare. Of course, sleep was not possible for me. It seemed to be one thing for me to climb up at night, not seeing anything, but when I will be up there, the sun will be out and – how to get down? I’ll be on a heap of crumbling rock, with nothing but 1800 m of air between me and the camp (and my trip home). I have to admit, I was somewhat scared, I hoped for a car accident, injury to my feet, an eruption of the volcano – of course nothing like this happened. Day 5 The day did start early, it’s been pitch dark, at 11pm. To climb the mountain, we’ve got another guide, Felix, very young and in very good shape. Fast walking, break, and the funny thing, as soon as we stopped, Felix slept. As mentioned before, climbing was relatively easy, even though I realized numerous times that I let pass an opportunity to stop the climb and let reason rule. Thinking of it, falling stones, slippery rocks, and as soon as there will be light, you know where you are – this sure makes for a great vacation. And of course, sweat and freeze. And then, the sun rose, and everything beyond imagination. Crater Highlands, Rift Valley, Tanzania Summer 2011 p.5 Rough beauty up there, only air around my head (and not much in between my ears). Small ridge between the crater on one side and 1800 m downhill on the other side. I almost didn’t feel like making photos, my mind being preoccupied with the thought of getting out of here. Probably not very Swiss feelings … But, out we got, sitting down and searching one foothold after the other, step by step, stepping onto the “Concrete Plate”, on the top, testing every step carefully, will it hold? Ibra and Stanley did a wonderful job, making fun and jokes, I certainly appreciated – and of course, we made it (who, otherwise would have written this report?).
Recommended publications
  • Petrogenesis of Natrocarbonatite at Oldoinyo Lengai, East Africa— Evidence from Fe and U Isotope Variations
    PETROGENESIS OF NATROCARBONATITE AT OLDOINYO LENGAI, EAST AFRICA— EVIDENCE FROM FE AND U ISOTOPE VARIATIONS BY ZHENHAO ZHOU THESIS Submitted in partial fulfillment of the requirements for the degree of Master of Science in Geology in the Graduate College of the University of Illinois at Urbana-Champaign, 2017 Urbana, Illinois Adviser: Professor Craig C. Lundstrom Abstract Ol Doinyo Lengai (ODL), Tanzania, is the only active carbonatite volcano on earth. Cyclical activity that consists of quiescent natrocarbonatite lava flow, explosive silicate eruption and dormancy has been observed throughout the 20th century at ODL. From 2007 to 2008, ODL explosively erupted coexisting natrocarbonatites and nephelinites. Numerous studies have been aimed at understanding how ODL natrocarbonatite forms. Liquid immiscibility is a favored hypothesis although condensate fluid separation is an alternative model. However, the exact mechanism that forms the ODL natrocarbonatite remains unresolved. We carried out Fe and U isotope analyses among a variety of ODL samples. Our sample set includes natrocarbonatite that erupted in 2005, 2 comingled tephras (mixture of natrocarbonatite and nephelinite) and a sequence of 8 nephelinite tephras that erupted in 2007- 2008; as well as magnetites separated from 2005 natrocarbontite; Ti-andradites and clinopyroxenes that were separated from one of the nephelinite tephras. Our results show a lighter Fe isotope composition of natrocarbonatite (!56Fe of -0.08‰ relative to IRMM-14) compared to nephelinite tephras (-0.06 to 0.20 ‰ relative to IRMM-14). Magnetites yield heavier Fe isotope composition (0.03‰) than natrocarbonatite; Ti-andradite has the heaviest Fe isotope composition among all analyzed samples due to its enrichment in Fe3+.
    [Show full text]
  • Walking and Wildlife in Tanzania
    WALKING AND WILDLIFE IN TANZANIA TRIP SUMMARY HIGHLIGHTS • Sitting in front of your tent and listening to the sounds of the bush • Having your eyes opened to by our naturalist guides to everything around you • Learning about Maasai culture and lifestyle • Visiting three completely different National Parks: Tarangire, Serengeti, and Ngorongoro Crater • Witnessing the Great Migration of vast herds of wildebeest and zebra • Watching elephants, lions, giraffes, antelopes, warthogs, and hippos, many of whom have babies this time of year Phone: 877-439-4042 Outside the US: 410-435-1965 Email: [email protected] TRIP AT A GLANCE Location: Tanzania Activities: Hiking Arrive: Arrive Kilimanjaro Airport (JRO) by 9 PM on Day 1. There are usually 2 - 3 flights a day and we will arrange one shuttle to meet the 3:30 flight pm and another for the 8:40pm flight. Depart: You can plan an evening flight out after 5:15PM on the last day TRIP OVERVIEW Our African safari combines a traditional jeep-based safari during the amazing wildebeest and zebra migration with a walking safari in a remote part of Ngorongoro Highlands and the Great Rift Valley. Visiting Tarangire, Serengeti, and Ngorongoro National Parks by jeep allows us to quickly go where the wildlife is best. The trek, going past the Ngorongoro Highlands across the Great Rift Valley to Lake Natron and Northeastern Serengeti, with its minimal civilization and infrastructure, provides a more intimate experience of the wilderness as well as the surrounding communities that have lived there forever. Imagine sitting in the African bush at night, listening to the sounds of the bush with the skies ablaze overhead.
    [Show full text]
  • Volcanic Hot-Spot Detection Using SENTINEL-2: a Comparison with MODIS–MIROVA Thermal Data Series
    remote sensing Article Volcanic Hot-Spot Detection Using SENTINEL-2: A Comparison with MODIS–MIROVA Thermal Data Series Francesco Massimetti 1,2,*, Diego Coppola 1,3 , Marco Laiolo 1,3 , Sébastien Valade 4,5, Corrado Cigolini 1,3 and Maurizio Ripepe 2 1 Dipartimento di Scienze della Terra, Università di Torino, V. Valperga Caluso 35, 10125 Torino, Italy; [email protected] (D.C.); [email protected] (M.L.); [email protected] (C.C.) 2 Dipartimento di Scienze della Terra, Università di Firenze, V. G. La Pira 4, 50121 Firenze, Italy; maurizio.ripepe@unifi.it 3 NATRISK: Centro Interdipartimentale sui Rischi Naturali in Ambiente Montano e Collinare, Università di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco (TO), Italy 4 Dep. Computer Vision & Remote Sensing, Technische Universität Berlin, 10587 Berlin, Germany; [email protected] 5 GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany * Correspondence: [email protected] Received: 9 January 2020; Accepted: 1 March 2020; Published: 3 March 2020 Abstract: In the satellite thermal remote sensing, the new generation of sensors with high-spatial resolution SWIR data open the door to an improved constraining of thermal phenomena related to volcanic processes, with strong implications for monitoring applications. In this paper, we describe a new hot-spot detection algorithm developed for SENTINEL-2/MSI data that combines spectral indices on the SWIR bands 8a-11-12 (with a 20-meter resolution) with a spatial and statistical analysis on clusters of alerted pixels. The algorithm is able to detect hot-spot-contaminated pixels (S2Pix) in a wide range of environments and for several types of volcanic activities, showing high accuracy performances of about 1% and 94% in averaged omission and commission rates, respectively, underlining a strong reliability on a global scale.
    [Show full text]
  • Geologic Map of Oldonyo Lengai (Oldoinyo Lengai) Volcano and Surroundings, Arusha Region, United Republic of Tanzania
    Geologic Map of Oldonyo Lengai (Oldoinyo Lengai) Volcano and Surroundings, Arusha Region, United Republic of Tanzania By David R. Sherrod, Masota M. Magigita, and Shimba Kwelwa Pamphlet to accompany Open-File Report 2013-1306 2013 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior SALLY JEWELL, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2013 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. Suggested citation: Sherrod, D.R., Magitita, M.M., and Kwelwa, S., 2013, Geologic map of Oldonyo Lengai (Oldoinyo Lengai) and surroundings, Arusha Region, United Republic of Tanzania: U.S. Geological Survey Open-File Report 2013-1306, pamphlet 65 p., 1 sheet, scale 1:50,000, with GIS database, http://dx.doi.org/10.3133/ofr20131306. ISSN 2331-1258 Contents Introduction . 1 Brief Geologic History of the Southernmost Lake Natron Basin . 2 Setting the Stage . 2 Enter the Youngest Volcano . 3 Debris-Avalanche Deposits . 3 Stratigraphic and Structural Features of the Natron Escarpment .
    [Show full text]
  • Introduction to Volcanoes and Volcanic Hazard Assessment in Meteor
    https://meteor-project.org INTRODUCTION TO VOLCANOES AND VOLCANIC HAZARD ASSESSMENT IN METEOR https://meteor-project.org Outline • Introduction to Volcanoes - Types of volcano - Style and Size of eruptions - Volcanic Hazards: PDCs, Tephra, Lahar - Volcanic Hazard Management • Modelling volcanic hazards – METEOR - Volcanic hazards in Tanzania - Tephra2 Simulations - Lahar and PDC basin modelling https://meteor-project.org Introduction to volcanoes • 10% of the world’s population live within 100 km of a volcano active in the last 10,000 years • The explosive potential of a volcano is linked to magma viscosity and gas content. • Low viscosity magmas have effusive eruptions • High viscosity magmas tend to have more explosive eruptions. Figures from the Smithsonian Institute Global Volcanism ProgramImage and credit: CIESIN Pu’u’O’o’ gridded vent, population Hawaii. data USGS. https://meteor-project.org Types of Volcanoes Shield Volcano Broadly 2 types of volcanoes: Shield Volcano: Low viscosity lavas, forming gentle slopes. Hawaiian type volcanoes Stratovolcano: Higher viscosity lavas, forming steep slopes as lavas build up around the vent of the volcano. More likely to produce explosive eruptions due to gas build up. Other: Fissure, Cinder cones, Domes, Caldera Caldera’s are formed in very large, highly explosive eruptions. Stratovolcano Image Source: BGS, UKRI https://meteor-project.org Styles of eruption • Hawaiian / Strombolian: Least violent – lava flows and fire fountains. Lava fragments. Hawaiian Strombolian Image credit: ESA Earth Online • Vulcanian: Small to Image credit: USGS moderate eruptions. Can generate ash columns up to 20km high. • Plinian eruptions: Form large ash columns (20 -35km tall), which may collapse. Plinian Vulcanian Image credit: USGS Image credit: BGS https://meteor-project.org The size of eruptions Volcanic Explosivity Index • 0 – 8 Scale • Logarithmic.
    [Show full text]
  • Crustal Movement at Ol Doinyo Lengai Based on GPS Measurements
    Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography ISSN 1598-4850(Print) Vol. 38, No. 5, 401-406, 2020 ISSN 2288-260X(Online) https://doi.org/10.7848/ksgpc.2020.38.5.401 Original article Crustal Movement at Ol Doinyo Lengai based on GPS Measurements Meshili, Valerie Ayubu1) · Kwon, Jay Hyoun2) Abstract Continuously monitoring of Horizontal and Vertical movements in vulnerable areas due to earthquakes and volcanic activities is vital. These geohazard activities are the result of a slow deformation rate at the tectonic plate boundaries. The recent development of GPS (Global Positioning System) technology has made it possible to attain a millimeter level changes in the Earth’s crust. This study used continuously observed GPS data at the flank of Ol Doinyo Lengai volcanic Mountain to determine crustal motion caused by impinging volcano from mantle convention. We analyzed 8 GPS observed from June 2016 to Dec 2019 using a well-documented Global Kalman Filter GAMIT/GLOBK software. The resulting velocity from GAMIT/GLOBK analysis was then used to compute the relative motion of our study area with respect to Nubia plate. Our analysis discovered a minor motion of less than 5mm/year in both horizontal and vertical components. Keywords : Horizontal and Vertical Crustal Movement, Global Positioning System, Geodetic Velocity, Ol Doinyo Lengai, East African Rift 1. Introduction Lately, space geodetic techniques have been used in determining crustal motions. Among the many space geodesy The eastern branch of the great EAR (East African Rift) systems; GPS has recently advanced in determining horizontal is well known for its richness in magma which makes it an and vertical velocity fields in a well-defined reference frame ideal place to study crustal motion associated with magmatic (Altamimi et al., 2011).
    [Show full text]
  • Region 2 Africa and Red
    Appendix B – Region 2 Country and regional profiles of volcanic hazard and risk: Africa and Red Sea S.K. Brown1, R.S.J. Sparks1, K. Mee2, C. Vye-Brown2, E.Ilyinskaya2, S.F. Jenkins1, S.C. Loughlin2* 1University of Bristol, UK; 2British Geological Survey, UK, * Full contributor list available in Appendix B Full Download This download comprises the profiles for Region 2: Africa and Red Sea only. For the full report and all regions see Appendix B Full Download. Page numbers reflect position in the full report. The following countries are profiled here: Region 2 Africa and Red Sea Pg.90 Algeria 98 Cameroon 103 Chad 109 Democratic Republic of Congo 114 Djibouti 121 Equatorial Guinea 127 Eritrea 133 Ethiopia 139 Kenya 147 Libya 154 Mali 159 Niger 164 Nigeria 169 Rwanda 174 Sao Tome and Principe 180 Sudan 185 Tanzania 191 Uganda 198 Brown, S.K., Sparks, R.S.J., Mee, K., Vye-Brown, C., Ilyinskaya, E., Jenkins, S.F., and Loughlin, S.C. (2015) Country and regional profiles of volcanic hazard and risk. In: S.C. Loughlin, R.S.J. Sparks, S.K. Brown, S.F. Jenkins & C. Vye-Brown (eds) Global Volcanic Hazards and Risk, Cambridge: Cambridge University Press. This profile and the data therein should not be used in place of focussed assessments and information provided by local monitoring and research institutions. Region 2: Africa and Red Sea Figure 2.1 The distribution of Holocene volcanoes through the Africa and Red Sea region. The capital cities of the constituent countries are shown. Description Of all the regions of world we have the least historic and geologic information about Africa’s 152 volcanoes.
    [Show full text]
  • The Best of Northern Tanzania
    The Best of Northern Tanzania Naturetrek Itinerary Outline itinerary Day 1 Depart London. Day 2 Arrive Kilimanjaro & transfer Arusha. Day 3 Arusha National Park. Day 4/5 Lake Natron. Day 6/7 Lobo, Serengeti. Day 8/10 Ndutu, Serengeti Lake Natron & Ol Doinyo Lengai Day 11/12 Ngorongoro Crater. Day 13 Depart Kilimanjaro. Day 14 Arrive London. Departs March Focus Birds and mammals Grading A traditional vehicular wildlife and birdwatching safari. Limited walking around lodges. Grade A. African Elephants Dates and Prices Visit www.naturetrek.co.uk (tour code TZA03) or see the current Naturetrek brochure Highlights: Visit the world famous Ngorongoro Crater Witness the Wildebeest migration on the short-grass plains of the southern Serengeti Stunning scenery of Lake Natron and Ol Doinyo Lengai Game drives in Arusha & Lake Manyara National Parks Abundant birdlife Lion, Cheetah & Bat-eared Fox all likely Masai Giraffe, Black Rhino, Elephant & Buffalo Comfortable landcruisers with opening roof & guaranteed Superb Starling window seat Naturetrek Cheriton Mill Cheriton Alresford Hampshire SO24 0NG England T: +44 (0)1962 733051 F: +44 (0)1962 736426 E: [email protected] W: www.naturetrek.co.uk The Best of Northern Tanzania Itinerary NB. The itinerary below offers our planned programme of excursions. However, adverse weather & other local considerations can necessitate some re-ordering of the programme during the course of the tour, though this will always be done to maximise best use of the time and weather conditions available. Day 1 Depart London We are scheduled to leave from London Heathrow early this evening on a Kenya Airways flight to Kilimanjaro, following a change of aircraft in Nairobi, the capital of Kenya.
    [Show full text]
  • More on Rocks and Volcanoes Lesson 7
    MORE ON ROCKS AND VOLCANOES LESSON 7 Metamorphism From “meta” = change and “morph” = shape The transformation of rocks at high temperatures and pressures. 3 kinds: regional (burial), contact, hydrothermal Metamorphism at Plate Margins Metamorphism leads to changes in: 1) Rock Texture 2) Mineralogy Limestone Marble Sandstone Quartzite Development of foliation Shale Slate Schist Gneiss Runny Basalt – Shield Volcano Thick Andesite - Stratovolcano Thickest Rhyolite - Stratovolcano Ash and tephra Explosive eruption Volcanic bombs Pyroclastic flow (nuée ardente) Side vent Eroded cone Mud Sequential Old lava dome flows Lava cone ash and lava (older) layers Lavas Sills Lava flow Sedimentary rocks Dikes Fracturing Cinder cones Laccolith Lava pavement (cracked/broken) Metamorphic rocks Chimney Contact Granite metamorphism intrusion (older/cold) Magma chamber Shield Volcano Big Island of Hawaii Cinder Cones Sunset Crater Near Flagstaff, AZ Stratovolcano or Composite Cone Mt. Shasta, CA Fig. 09.24 W. W. Norton Volcanic Neck Devil’s Tower, WY Caldera Fig. 09.29b Crater Lake, OR – 10 km diameter Intrusive Rocks Source; http://public.fotki.com/rlephoto/ Source: http://www.californiapictures.com/ Sierra Nevada Mountains, California Volcanos of Africa (Triangles) Erta Ale (Eth.) Active Not Active Ardoukoba (Eth.) Nyamuragira Kilmanjaro Nyiragongo (DRC) Lengai, Ol Doinyo (Tanzania) Source: http://www.hrw.com/science/si-science/earth/tectonics/volcano/volcano/region02/index.html Erta Ale, Afar The 613-m-high volcano contains a 0.7 x 1.6 km, elliptical summit crater housing steep-sided pit craters. Another larger 1.8 x 3.1 km wide depression elongated parallel to the trend of the Erta Ale range is located to the SE of the summit and is bounded by curvilinear fault scarps on the SE side.
    [Show full text]
  • Journal of the East Africa Natural History Society and National Museum
    JOURNAL OF THE EAST AFRICA NATURAL HISTORY SOCIETY AND NATIONAL MUSEUM May 1989 Volume 79, Number 186 REPORT ON ACTIVITY IN THE NORTHERN CRATER OF OL DOINYO LENGAI, 24TH JUNE TO 1ST JULY 1988 Celia Nyamweru, Department of Geography, Kenyatta University, P.O Box 43844, Nairobi, Kenya. INTRODUCTION 01 Doinyo Lengai, the only active volcano in the Gregory Rift Valley of East Africa, is also the only active carbonatite volcano in the world. Several times this century it has erupted lava and ash composed largely of sodium carbonate minerals. Early accounts of its eruptive activity were given by Hobley (1918) and by Reck and Schulze (1921); later accounts were provided by Richard (1942), Guest, (1956), Dawson (1962) and Dawson, Bowden and Clark (1968). The most recent widely known eruption was the explosive eruption that occurred between August and October 1966. Few people, whetherin East Africa or elsewhere, are aware that the volcano erupted in earl y 1983, and that small scale activity in the northern crater has continued since then. A report on the activity from 1983 to 1987 has been published by the present author (Nyamweru 1988), and several short accounts have appeared in the Scientific Event Alert Network Bulletin between 1983 and 1988. The account that follows is the record of activity between 24th June and 1st July 1988, during which period the author was a member of a party that camped in the inactive (southern) comer of the north crater (area S in figures 1, 2 and 3). DIARY OF ERUPTIVE ACTIVITY 24-06-88, 1630 hours: First view into the crater when party members arrived on the crater rim.
    [Show full text]
  • Tanzania Country Profile Report
    i | P a g e TABLE OF CONTENTS TABLE OF CONTENTS ........................................................................................................ i LIST OF TABLES ................................................................................................................. v LIST OF FIGURES .............................................................................................................. vi COUNTRY FACT SHEET ................................................................................................... vii LIST OF ACRONYMS ....................................................................................................... viii EXECUTIVE SUMMARY ...................................................................................................... x 1. INTRODUCTION AND BACKGROUND ........................................................................ 1 1.1. Introduction ..................................................................................................................................... 1 1.2. Background ..................................................................................................................................... 1 1.3. Objectives of the Report ............................................................................................................ 2 1.4. Methodology ................................................................................................................................... 2 1.5. Structure of the Report ..............................................................................................................
    [Show full text]
  • International Geography Exam Part 1
    2018 International Geography Bee 6. Which of the following best defines the term ‘ancient International Geography Exam - Part 1 lake’? A. lakes of a specific geologic composition containing mostly metamorphic rocks Instructions – This portion of the IGB Exam consists of B. a lake containing certain types of aquatic species 100 questions. You will receive two points for a correct not found in other freshwater areas answer. You will lose one point for an incorrect answer. C. a lake that has consistently carried water for more Blank responses lose no points. Please fill in the bubbles than 1 million years completely on the answer sheet. You may write on the D. any lake that was formerly part of an ocean examination, but all responses must be bubbled on the answer sheet. Diacritic marks such as accents have been 7. In what district of Russia is Lake Baikal? omitted from place names and other proper nouns. You A. Ural have one hour to complete this set of multiple choice B. Siberia questions. C. Volga D. North Caucasus 1. All of these are true of megacities EXCEPT which of the following? 8. With regard to its formation, Lake Baikal is most similar A. there is dispute among academics and to which of the following? governmental organizations as to the precise A. Crater Lake in the United States definition of a megacity B. Lake Pontchartrain in the United States B. megacities are usually considered to be urban C. Lake Nasser in Egypt agglomerations of more than 10 million people D. the Rift Valley lakes of Africa C.
    [Show full text]