Beneath the Forest Is a Biannual Newsletter Published by the Forest Service of the U.S
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Emplacement of a Silicic Lava Dome Through a Crater Glacier: Mount St Helens, 2004–06
14 Annals of Glaciology 45 2007 Emplacement of a silicic lava dome through a crater glacier: Mount St Helens, 2004–06 Joseph S. WALDER, Richard G. LaHUSEN, James W. VALLANCE, Steve P. SCHILLING United States Geological Survey, Cascades Volcano Observatory, 1300 Southeast Cardinal Court, Vancouver, Washington WA 98683-9589, USA E-mail: [email protected] ABSTRACT. The process of lava-dome emplacement through a glacier was observed for the first time after Mount St Helens reawakened in September 2004. The glacier that had grown in the crater since the cataclysmic 1980 eruption was split in two by the new lava dome. The two parts of the glacier were successively squeezed against the crater wall. Photography, photogrammetry and geodetic measure- ments document glacier deformation of an extreme variety, with strain rates of extraordinary magnitude as compared to normal alpine glaciers. Unlike normal temperate glaciers, the crater glacier shows no evidence of either speed-up at the beginning of the ablation season or diurnal speed fluctuations during the ablation season. Thus there is evidently no slip of the glacier over its bed. The most reasonable explanation for this anomaly is that meltwater penetrating the glacier is captured by a thick layer of coarse rubble at the bed and then enters the volcano’s groundwater system rather than flowing through a drainage network along the bed. INTRODUCTION ice bodies have been successively squeezed between the Since October 2004, a lava dome has been emplaced first growing lava dome and the crater walls. through, and then alongside, glacier ice in the crater of Several examples of lava-dome emplacement into ice Mount St Helens, Washington state, US. -
1961 Climbers Outing in the Icefield Range of the St
the Mountaineer 1962 Entered as second-class matter, April 8, 1922, at Post Office in Seattle, Wash., under the Act of March 3, 1879. Published monthly and semi-monthly during March and December by THE MOUNTAINEERS, P. 0. Box 122, Seattle 11, Wash. Clubroom is at 523 Pike Street in Seattle. Subscription price is $3.00 per year. The Mountaineers To explore and study the mountains, forests, and watercourses of the Northwest; To gather into permanent form the history and traditions of this region; To preserve by the encouragement of protective legislation or otherwise the natural beauty of Northwest America; To make expeditions into these regions in fulfillment of the above purposes; To encourage a spirit of good fellowship among all lovers of outdoor Zif e. EDITORIAL STAFF Nancy Miller, Editor, Marjorie Wilson, Betty Manning, Winifred Coleman The Mountaineers OFFICERS AND TRUSTEES Robert N. Latz, President Peggy Lawton, Secretary Arthur Bratsberg, Vice-President Edward H. Murray, Treasurer A. L. Crittenden Frank Fickeisen Peggy Lawton John Klos William Marzolf Nancy Miller Morris Moen Roy A. Snider Ira Spring Leon Uziel E. A. Robinson (Ex-Officio) James Geniesse (Everett) J. D. Cockrell (Tacoma) James Pennington (Jr. Representative) OFFICERS AND TRUSTEES : TACOMA BRANCH Nels Bjarke, Chairman Wilma Shannon, Treasurer Harry Connor, Vice Chairman Miles Johnson John Freeman (Ex-Officio) (Jr. Representative) Jack Gallagher James Henriot Edith Goodman George Munday Helen Sohlberg, Secretary OFFICERS: EVERETT BRANCH Jim Geniesse, Chairman Dorothy Philipp, Secretary Ralph Mackey, Treasurer COPYRIGHT 1962 BY THE MOUNTAINEERS The Mountaineer Climbing Code· A climbing party of three is the minimum, unless adequate support is available who have knowledge that the climb is in progress. -
The Dynamics and Mass Budget of Aretic Glaciers
DA NM ARKS OG GRØN L ANDS GEO L OG I SKE UNDERSØGELSE RAP P ORT 2013/3 The Dynamics and Mass Budget of Aretic Glaciers Abstracts, IASC Network of Aretic Glaciology, 9 - 12 January 2012, Zieleniec (Poland) A. P. Ahlstrøm, C. Tijm-Reijmer & M. Sharp (eds) • GEOLOGICAL SURVEY OF D EN MARK AND GREENLAND DANISH MINISTAV OF CLIMATE, ENEAGY AND BUILDING ~ G E U S DANMARKS OG GRØNLANDS GEOLOGISKE UNDERSØGELSE RAPPORT 201 3 / 3 The Dynamics and Mass Budget of Arctic Glaciers Abstracts, IASC Network of Arctic Glaciology, 9 - 12 January 2012, Zieleniec (Poland) A. P. Ahlstrøm, C. Tijm-Reijmer & M. Sharp (eds) GEOLOGICAL SURVEY OF DENMARK AND GREENLAND DANISH MINISTRY OF CLIMATE, ENERGY AND BUILDING Indhold Preface 5 Programme 6 List of participants 11 Minutes from a special session on tidewater glaciers research in the Arctic 14 Abstracts 17 Seasonal and multi-year fluctuations of tidewater glaciers cliffson Southern Spitsbergen 18 Recent changes in elevation across the Devon Ice Cap, Canada 19 Estimation of iceberg to the Hansbukta (Southern Spitsbergen) based on time-lapse photos 20 Seasonal and interannual velocity variations of two outlet glaciers of Austfonna, Svalbard, inferred by continuous GPS measurements 21 Discharge from the Werenskiold Glacier catchment based upon measurements and surface ablation in summer 2011 22 The mass balance of Austfonna Ice Cap, 2004-2010 23 Overview on radon measurements in glacier meltwater 24 Permafrost distribution in coastal zone in Hornsund (Southern Spitsbergen) 25 Glacial environment of De Long Archipelago -
Rapid Glacial Retreat on the Kamchatka Peninsula During the Early 21St Century” by Colleen M
The Cryosphere Discuss., doi:10.5194/tc-2016-42-RC2, 2016 TCD © Author(s) 2016. CC-BY 3.0 License. Interactive comment Interactive comment on “Rapid glacial retreat on the Kamchatka Peninsula during the early 21st Century” by Colleen M. Lynch et al. Anonymous Referee #2 Received and published: 16 May 2016 STRENGTHS: Positively 1 - A huge amount of work behind the paper Positively 2 - A good review of associated publications, including Russian authors WEAKNESSES: - The paper is too long. The text contains lots of unnecessary naturally clear details and numbers which hinder its perception. Most numbers should be removed and put in the tables. Printer-friendly version - The authors don’t seem to take into account the uniqueness of Kamchatka region Discussion paper as an area where Holocene volcanism exists along with glaciation and can not help affecting it. The accomplished analysis is of a “standard” (formal) type, the same as for C1 non-volcanic regions. TCD However, along with tephra of recent eruptions (mentioned in the paper) many glaciers in Kamchatka (or their tongues) which motion is permanently destroying the friable slopes of Holocene volcanoes appear to be buried under a thick layer of deposits and Interactive continue flowing with it. comment At the same time they are nothing to do with rock glaciers having usually a snow- covered accumulation zone and a high flow velocity. In other words, they keep all glacial features but have a thick cover of deposits on themselves which exceeds obviously 5 cm, the threshold used in the paper for digitizing of glacial margins, which seems to be totally invalid for glacial mapping in Kamchatka. -
Mount St. Helens National Volcanic Monument: Preserved to Change the Real Treasure of the Mount St
OLCANO REVIEW VA VISITOR’S GUIDE TO MOUNT ST. HELENS NATIONAL VOLCANIC MONUMENT Mount St. Helens National Volcanic Monument: Preserved to Change The real treasure of the Mount St. Helens National Volcanic Monument is not the volcano or the surrounding landscape; it lies in the idea that this monument should be protected so that nature can work at its own pace to renew the land. Most protected areas are managed to keep them as they once were so that future generations will have an experience similar to what early visitors to the site would have had. Mount St. Helens National Volcanic Monument was set aside in the hopes that the next generation will have an experience markedly different than the one we have today. The Forest Service has worked hard to protect this valued place while ensuring public safety and providing recreational, educational and research opportunities. This precarious task can only be successful through partnering with our local communities. Join us in helping to provide a unique experience for future generations by sharing nature’s monumental achievements at Mount St. Helens National Volcanic Monument. Photo by Gavin Farrell U.S. Forest Service Gifford Pinchot National Forest Take Care of Your Pet and WELCOME Help Protect the Monument To protect plant and animal life and provide for visitor safety, pets are prohibited at all recreation sites and trails here is a lot going on within the monument’s restricted area (see yellow shaded section at the Monument of map on page 7). Pets are permitted only in designated pet Tthis summer. -
Mount St. Helens, 1980 to Now—What's Going
U.S. GEOLOGICAL SURVEY and the U.S. FOREST SERVICE—OUR VOLCANIC PUBLIC LANDS Mount St. Helens, 1980 to Now—What’s Going On? ount St. Helens seized M the world’s attention in 1980 when the largest historical landslide on Earth and a powerful explosive eruption reshaped the volcano, created its distinctive cra- ter, and dramatically modified the surrounding landscape. An enor- mous lava dome grew episodically in the crater until 1986, when the volcano became relatively quiet. A new glacier grew in the crater, wrapping around and partly burying the lava dome. From 1987 to 2003, sporadic earthquake swarms and small steam explosions indicated that magma (molten rock) was be- ing replenished deep underground. In 2004, steam-and-ash explosions heralded the start of another erup- More is going on than meets the eye in this south-facing photo of Mount St. Helens taken on June 8, 2005. tion. A quieter phase of continuous An unrelenting flow of semi-solid magma rises from a vent on the crater floor at a rate of about 10 feet per lava extrusion followed and lasted day, pushing up skyscraper-size spines. The spines collapse to form a steaming mound of lava called a lava until 2008, building a new dome dome. Split in two by the growing dome, Crater Glacier has started to flow more quickly northward. When the and doubling the volume of lava eruption ended in early 2008, the two arms of the glacier had met again after encircling both the new dome on the crater floor. Scientists with and an earlier one that grew from 1980 to 1986. -
Observations of Seasonal and Diurnal Glacier Velocities at Mount Rainier, Washington, Using Terrestrial Radar Interferometry
The Cryosphere, 9, 2219–2235, 2015 www.the-cryosphere.net/9/2219/2015/ doi:10.5194/tc-9-2219-2015 © Author(s) 2015. CC Attribution 3.0 License. Observations of seasonal and diurnal glacier velocities at Mount Rainier, Washington, using terrestrial radar interferometry K. E. Allstadt1,a, D. E. Shean1,2, A. Campbell1, M. Fahnestock3, and S. D. Malone1 1University of Washington, Department of Earth and Space Sciences, Washington, USA 2University of Washington, Applied Physics Lab Polar Science Center, Washington, USA 3University of Alaska Fairbanks, Geophysical Institute, Fairbanks, Alaska, USA anow at: USGS Geologic Hazards Science Center, Golden, CO, USA Correspondence to: K. E. Allstadt ([email protected]) Received: 16 June 2015 – Published in The Cryosphere Discuss.: 31 July 2015 Revised: 11 November 2015 – Accepted: 16 November 2015 – Published: 1 December 2015 Abstract. We present surface velocity maps derived from re- 1 Introduction peat terrestrial radar interferometry (TRI) measurements and use these time series to examine seasonal and diurnal dy- namics of alpine glaciers at Mount Rainier, Washington. We Direct observations of alpine glacier velocity can help im- show that the Nisqually and Emmons glaciers have small prove our understanding of ice dynamics. Alpine glacier slope-parallel velocities near the summit (< 0.2 m day−1), surface velocities are typically dominated by basal sliding, high velocities over their upper and central regions (1.0– which is tightly coupled to subglacial hydrology (Anderson 1.5 m day−1), and stagnant debris-covered regions near the et al., 2014; Bartholomaus et al., 2007). However, the spatial terminus (< 0.05 m day−1). -
Mount St. Helens from Wikipedia, the Free Encyclopedia This Article Is About the Volcano in Washington State. for the 1980 Eruption, Se E 1980 Eruption of Mount St
Mount St. Helens From Wikipedia, the free encyclopedia This article is about the volcano in Washington State. For the 1980 eruption, se e 1980 eruption of Mount St. Helens. For the mountain in California, see Mount S aint Helena. Mount St. Helens Louwala-Clough MSH82 st helens plume from harrys ridge 05-19-82.jpg 3,000 ft (1 km) steam plume on May 19, 1982, two years after its major eruption Highest point Elevation 8,363 ft (2,549 m) Prominence 4,605 ft (1,404 m) Coordinates 46°11'28?N 122°11'40?WCoordinates: 46°11'28?N 122°11'40?W?[1] Geography Location Skamania County, Washington, United States Parent range Cascade Range Topo map USGS Mount St. Helens Geology Age of rock < 40,000 yrs Mountain type Active stratovolcano Volcanic arc Cascade Volcanic Arc Last eruption July 10, 2008 Climbing First ascent 1853 by Thomas J. Dryer Easiest route Hike via south slope of volcano (closest area near eruption site ) Mount St. Helens or Louwala-Clough (known as Lawetlat'la to the indigenous Cowli tz people, and Loowit to the Klickitat) is an active stratovolcano located in Sk amania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle, Washington, and 50 miles (80 km) nort heast of Portland, Oregon. Mount St. Helens takes its English name from the Brit ish diplomat Lord St Helens, a friend of explorer George Vancouver who made a su rvey of the area in the late 18th century.[1] The volcano is located in the Casc ade Range and is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. -
Extreme Weather Impacts Lewis County Farmers
Randle Man Continues Battle With Department of Licensing / Main 3 Weekend Edition Bringing Grains Saturday, Back to Home Sept. 14, 2013 Gardens $1 Reaching 110,000 Readers in Print and Online — www.chronline.com / Life 1 Siblings Fight Against MS W.F. West Wins Big Leah and Adam Isaacson Raise Money to Battle Bearcats Pound Archbishop Disease That Killed Their Mother / Main 7 Murphy 58-24 / Sports 1 The Murder Case That Won’t End Kenneth Slert’s Murder Conviction, Which Has Been Reversed Three Times, Will Go Before the State Supreme Court in October By Stephanie Schendel murder three different times in prison sentence, prosecutors [email protected] Lewis County Superior Court in will go before the state Supreme the past decade for the shooting Court in hopes of convincing Lewis County prosecutors and killing of John Benson, 53, the justices that Slert’s third will argue before the state Su- at a hunting camp in 2000. Each conviction should be his final preme Court in October against conviction, however, has been one. a Washington Court of Appeals’ overturned by a higher court. Slert appealed his 2010 con- decision to reverse the murder Now, more than 13 years viction on the grounds that conviction of Kenneth Slert. after the slaying occurred, and The Chronicle / file photo Slert has been convicted of halfway through Slert’s 22-year please see MURDER, page Main 9 Kenneth Slert smiles as he enters the courtroom during his 2010 murder trial. Deputy Extreme Weather Impacts Pleads Lewis County Farmers Innocent to DUI CHARGED: Lewis County Detective Jeff S. -
REBUILDING MOUNT ST. HELENS Helens, Washington: U.S
U.S. Department of the Interior Scientific Investigations Map 2928 U.S. Geological Survey Mount St. Helens, Washington On May 18, 1980, Mount St. Helens, Washington exploded in a spectacular and devastating eruption that shocked the world. The eruption, one of the most powerful in the history of the United States, removed 2.7 cubic kilometers of rock from the volcano’s edifice, the bulk of which had been constructed by nearly 4,000 years of lava-dome-building eruptions. In seconds, the mountain’s summit elevation was lowered from 2,950 meters to 2,549 meters, leaving a north-facing, horseshoe-shaped crater over 2 kilometers wide. 1980-861980-86 Following the 1980 eruption, Mount St. Helens remained active. A large lava dome DomeDome began episodically extruding in the center of the volcano’s empty crater. This dome-building eruption lasted until 1986 and added about 80 million cubic meters of rock to the volcano. During the two decades following the May 18, 1980 eruption, Crater Glacier formed tongues of ice around the east and west sides of the lava dome in the deeply shaded niche between the lava dome and the south crater wall. C rate r Glacier Long the most active volcano in the Cascade Range with a complex 300,000-year history, Mount St. Helens erupted again in the fall of 2004 as a new period of dome building began within the 1980 crater. Between October 2004 and February 2006, about 80 million cubic meters of dacite lava erupted immediately south of the 1980-86 lava dome. -
The Seismicity of the 2009 Redoubt Eruption
University of South Florida Masthead Logo Scholar Commons School of Geosciences Faculty and Staff School of Geosciences Publications 6-1-2013 The eiS smicity of the 2009 Redoubt Eruption Helena Buurman University of Alaska Fairbanks Michael E. West University of Alaska Fairbanks Glenn Thompson University of Alaska Fairbanks, [email protected] Follow this and additional works at: https://scholarcommons.usf.edu/geo_facpub Scholar Commons Citation Buurman, Helena; West, Michael E.; and Thompson, Glenn, "The eiS smicity of the 2009 Redoubt Eruption" (2013). School of Geosciences Faculty and Staff Publications. 891. https://scholarcommons.usf.edu/geo_facpub/891 This Article is brought to you for free and open access by the School of Geosciences at Scholar Commons. It has been accepted for inclusion in School of Geosciences Faculty and Staff ubP lications by an authorized administrator of Scholar Commons. For more information, please contact [email protected]. Journal of Volcanology and Geothermal Research 259 (2013) 16–30 Contents lists available at SciVerse ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores The seismicity of the 2009 Redoubt eruption Helena Buurman ⁎, Michael E. West, Glenn Thompson Alaska Volcano Observatory, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK, 99775–7320, USA article info abstract Article history: Redoubt Volcano erupted in March 2009 following 6 months of precursory seismic activity. The 4.5-month- Received 9 June 2011 long eruptive sequence was accompanied by phreatic and magmatic explosions, periods of steady dome Accepted 20 April 2012 growth, lahars, seismic swarms, extended episodes of volcanic tremor and changes in the background Available online 4 May 2012 seismicity rate. -
Assessing Lahars from Ice-Capped Volcanoes Using ASTER Satellite Data, the SRTM DTM and Two Different Flow Models: Case Study On
Nat. Hazards Earth Syst. Sci., 8, 559–571, 2008 www.nat-hazards-earth-syst-sci.net/8/559/2008/ Natural Hazards © Author(s) 2008. This work is distributed under and Earth the Creative Commons Attribution 3.0 License. System Sciences Assessing lahars from ice-capped volcanoes using ASTER satellite data, the SRTM DTM and two different flow models: case study on Iztacc´ıhuatl (Central Mexico) D. Schneider1, H. Delgado Granados2, C. Huggel1, and A. Ka¨ab¨ 3 1Glaciology, Geomorphodynamics and Geochronology, Department of Geography, University of Zurich, Switzerland 2Instituto de Geof´ısica, Universidad Nacional Autonoma´ de Mexico´ (UNAM), Mexico City, Mexico 3Department of Geosciences, University of Oslo, Norway Received: 14 December 2007 – Revised: 19 May 2008 – Accepted: 19 May 2008 – Published: 17 June 2008 Abstract. Lahars frequently affect the slopes of ice-capped (DTM) used on the results. As a consequence, the predicted volcanoes. They can be triggered by volcano-ice interac- affected areas can vary significantly. For such hazard zona- tions during eruptions but also by processes such as intense tion, we therefore suggest the use of different types of DTMs precipitation or by outbursts of glacial water bodies not di- and flow models, followed by a careful comparison and in- rectly related to eruptive activity. We use remote sensing, terpretation of the results. GIS and lahar models in combination with ground observa- tions for an initial lahar hazard assessment on Iztacc´ıhuatl volcano (5230 m a.s.l.), considering also possible future de- velopments of the glaciers on the volcano. Observations 1 Introduction of the glacial extent are important for estimations of future hazard scenarios, especially in a rapidly changing tropical Lahars are mixtures of water and volcanic debris of varying glacial environment.