Ogasawara Islands Japan
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Identification of Infrasonic and Seismic Components of Tremors in Single
Kurokawa and Ichihara Earth, Planets and Space (2020) 72:171 https://doi.org/10.1186/s40623-020-01302-2 FULL PAPER Open Access Identifcation of infrasonic and seismic components of tremors in single-station records: application to the 2013 and 2018 events at Ioto Island, Japan Aika K. Kurokawa1* and Mie Ichihara2 Abstract Infrasonic stations are sparse at many volcanoes, especially those on remote islands and those with less frequent eruptions. When only a single infrasound station is available, the seismic–infrasonic cross-correlation method has been used to extract infrasound from wind noise. However, it does not work with intense seismicity and sometimes mistakes ground-to-atmosphere signals as infrasound. This paper proposes a complementary method to identify the seismic component and the infrasonic component using a single microphone and a seismometer. We applied the method to estimate the surface activity on Ioto Island. We focused on volcanic tremors during the phreatic eruption on April 11, 2013, and during an unconfrmed event on September 12, 2018. We used the spectral amplitude ratios of the vertical ground motion to the pressure oscillation and compared those for the tremors with those for known signals generated by volcano-tectonic earthquakes and airplanes fying over the station. We were able to identify the infrasound component in the part of the seismic tremor with the 2013 eruption. On the other hand, the tremor with the unconfrmed 2018 event was accompanied by no apparent infrasound. We interpreted the results that the infrasound with the 2013 event was excited by the vent opening or the ejection of ballistic rocks, and the 2018 event was not an explosive eruption either on the ground or in the shallow water. -
Endemic Land Snail Fauna (Mollusca) on a Remote Peninsula in the Ogasawara Archipelago, Northwestern Pacific1
Endemic Land Snail Fauna (Mollusca) on a Remote Peninsula in the Ogasawara Archipelago, Northwestern Pacific1 Satoshi Chiba2,3, Angus Davison,4 and Hideaki Mori3 Abstract: Historically, the Ogasawara Archipelago harbored more than 90 na- tive land snail species, 90% of which were endemic. Unfortunately, about 40% of the species have already gone extinct across the entire archipelago. On Haha- jima, the second-largest island and the one on which the greatest number of species was recorded, more than 50% of species are thought to have been lost. We report here the results of a recent survey of the snails of a remote peninsula, Higashizaki, on the eastern coast of Hahajima. Although the peninsula is small (@0.3 km2) and only part is covered by forest (<0.1 km2), we found 12 land snail species, all of which are endemic to Ogasawara. Among these species, five had been thought to already be extinct on Hahajima, including Ogasawarana yoshi- warana and Hirasea acutissima. Of the former, there has been no record since its original description in 1902. Except for the much larger island of Anijima and the main part of Hahajima, no single region on the Ogasawara Archipelago maintains as great a number of native land snail species. It is probable that the land snail fauna of the Higashizaki Peninsula is exceptionally well preserved be- cause of a lack of anthropogenic disturbance and introduced species. In some circumstances, even an extremely small area can be an important and effective refuge for threatened land snail faunas. The native land snail fauna of the Pacific one such example: of 95 recorded species, islands is one of the most seriously endan- more than 90% are endemic (Kuroda 1930, gered faunas in the world (e.g., Murray et al. -
Differences in Vocalizations of Japanese Bush Warblers on Chichijima and Hahajima in the Ogasawara Islands
Bull. Natl. Mus. Nat. Sci., Ser. A, 44(4), pp. 125–132, November 22, 2018 Differences in Vocalizations of Japanese Bush Warblers on Chichijima and Hahajima in the Ogasawara Islands Shoji Hamao Department of Zoology, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki, 305–0005 Japan E-mail: [email protected] (Received 4 August 2018; accepted 26 September 2018) Abstract Bird songs play an important role in species recognition in reproductive behaviors. Therefore, geographic variation in the songs of a given species affects gene flow and reproductive isolation. A previous study showed that Japanese bush warblers, Cettia diphone, on Hahajima in the Ogasawara (Bonin) Islands sing songs with a simpler acoustic structure than those of C. diphone in mainland Japan. I investigated whether the acoustic structure of songs differs between the populations on two neighboring islands, Chichijima and Hahajima. In type-H songs, the maxi- mum frequency was lower, the minimum frequency was higher, and the frequency range was, therefore, narrower on Hahajima than on Chichijima. In type-L songs, the maximum and minimum frequencies were lower and the frequency range was narrower on Hahajima than on Chichijima. A possible factor giving rise to the narrower frequency range on Hahajima is the sound transmission properties of the habitat, although further studies are needed to explore this hypothesis. Loose iso- lation among populations could produce differences in song structure because birdsong is a cultur- ally transmitted trait. Key words: acoustic structure, Cettia diphone, geographic variation, Japanese bush warbler, Ogasawara Islands, song Parus major, within a habitat, suggesting that Introduction blue tits use species-specific songs (i.e., songs Like morphological traits, bird songs have with a trill) to reduce aggressive interactions evolved under various selection pressures from with great tits, whose songs never include trills ecological and social factors (Kroodsma and (Doutrelant and Lambrechts, 2001). -
Petrology and Geochemistry of Boninite Series Volcanic Rocks, Chichi-Jima, Bonin Islands, Japan
PETROLOGY AND GEOCHEMISTRY OF BONINITE SERIES VOLCANIC ROCKS, CHICHI-JIMA, BONIN ISLANDS, JAPAN P.F. Dobson Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 S. Maruyama Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan J.G. Blank Center for the Study of Life in the Universe, SETI Institute, 515 N. Whisman Road, Mountain View, California 94043 J.G. Liou Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305 Abstract An Eocene submarine boninite series volcanic center is exposed on the island of Chichi-jima, Bonin Islands, Japan. Five rock types, boninite, bronzite andesite, dacite, quartz dacite, and rhyolite, were distinguished within the boninite volcanic sequence on the basis of petrographic and geochemical observations. Boninite lavas contain high magnesium, nickel, and chromium contents indicative of primitive melts, but have high silica contents relative to other mantle- derived magmas. All boninite series lavas contain very low incompatible element concentrations, and concentrations of high-field strength elements in primitive boninite lavas are less than half of those found in depleted mid-ocean ridge basalts. Abundances of large-ion lithophile elements are relatively high in boninite series lavas, similar to the enrichments observed in many island arc lavas. Trends for both major and trace element data suggest that the more evolved lavas of the boninite magma series were derived primarily through high-level fractional crystallization of boninite. Textural features, such as resorption and glomeroporphyrocrysts, and reverse chemical zonations suggest that magma mixing contributed to the development of the quartz dacite lavas. Introduction A well exposed sequence of Eocene boninite series volcanic rocks are found on Chichi-jima (Figure 1), the type locality for boninites (Peterson, 1891). -
Chapter 2. Deploying Land, Infrastructure, Transport And
Section 2 Measures, etc. against Aging Social Infrastructures Deploying Land, Infrastructure, Transport and Chapter 2 Tourism Administration Tailored to Urges of the Times II Chapter 2 Section 1 Driving the Implementation of a National Land Policy Package The implementation of a comprehensive national land policy package has been driven on the basis of a full package of Deploying Land, Infrastructure, Transport and Tourism Administration Tailored to Urges of the Times to Urges Administration Tailored and Tourism Transport Deploying Land, Infrastructure, measures designed to guide the work of national spatial land planning; namely, National Spatial Strategies (national plan) (2008 Cabinet decision), which envisions “the construction of a national land where diverse regional blocks develop autonomously and the creation of a beautiful national land where life is comfortable” as a new vision of national land, Global Regional Plans (2009 Minister decision), which summarize the regional strategies of the individual global blocks and the specific approaches they take to implement the strategies and the Fourth National Land Use Plan (national plan) (2008 Cabinet decision), which is committed to a key principle of sustainable land management. The implementation of these plans is being monitored from year to year to get them consolidated among the stakeholders concerned with National Spatial Strategies. About seven years since the formulation of National Spatial Strategies (national plan), Japan is confronted with drastic changes, such as intensifying competition between nations and cities in pace with progressive globalization and imminent possible threats from huge natural disasters, such as the Nankai Trough Mega Earthquake and Tokyo Inland Earthquake, as well as a rapidly shrinking population in an aging society with falling birthrates, with the population predicted to halve in about 60% of all the regions in 2050 and elderly people accounting for about 40% of the total population. -
Volcano Monitoring
Nov. 1st, 2018 JPTM2018 Volcano Monitoring Location : Sakurajima Date : Jan. 2, 2013 Camera : Canon EOS 60D F number : 5.6 Shutter speed : 30 seconds ISO : 800 Photographer : JMA expert 1 Today’s topics HOW CAN WE USE ALOS-2 DATA FOR MONITORING VOLCANOES? 2 Active Volcanoes in Japan • 111 active volcanoes (Active volcanoes: it erupted within 10,000 years) • 5 volcanoes erupted this year (Kusatsu -Shiranesan, Kirishimayama (Shinmoedake, Iwo-yama crater), Nishinoshima, Sakurajima, Suwanosejima ) • 50 volcanoes are continuously monitored. circle: active volcanoes, red-triangle: erupted this year 3 Volcanic Observation and Warning Center Continuous Observation stations Seismometer GNSS Tiltmeter Camera Remote sensing Volcanic Observation and Warning Center offline data Volcanic Observation and Information System(VOIS) Information Schema of volcanic process Warning/ Multi Volcanic activity Unrest/anomaly ・Local Governments ・Mass media Monitoring and Analysis × × × ・Public × × × × × × Quick Evaluation Web Site online Collaborative Work Coordinating reference Committee for Prediction of Past events DB Volcanic Eruption JMA Experts Mobile PC Local Governments Explanation 4 Advantages of ALOS-2(PALSAR-2) data GNSS ALOS-2 data Observed Land-covering Coordinate of point data deformation Equipment Need to built NOT need to built on land observation stations observation stations In spite of isolated islands or activated volcanoes where we can’t access, volcanic activities are monitored. ~In Emergency situation~ Detect volcanic unrest/anomalies JAXA judges schedules of ALOS-2 observation JMA orders JAXA take an emergency observation data an emergency observation (originally planned observation cancelled) 5 Kusatsu-Shiranesan volcano Erupted on Jan. 23th, 2018 • Kusatsu-Shiranesan is an active volcanone which has 3 pyroclastic cones. • Yugama is the most active crater of Kusatsu-Shiranesan. -
Natural Park System in Japan
Natural Park Systems in Japan CONTENTS 1. Natural Park Systems --------------------------------------------------------------------------- 1 1.1 Purposes of Natural Parks ------------------------------------------------------------------ 1 1.2 History of Natural Parks --------------------------------------------------------------------- 1 1.3 Characteristics of Natural Parks ----------------------------------------------------------- 2 1.4 Park Plans --------------------------------------------------------------------------------------- 2 1.5 Controls / Regulation of Activities --------------------------------------------------------- 3 2. Present State of Natural Parks in Japan ---------------------------------------------------- 4 2.1 Designation ------------------------------------------------------------------------------------- 4 2.2 Distribution of National Parks -------------------------------------------------------------- 5 2.3 Distribution of Marine Parks ---------------------------------------------------------------- 6 2.4 Visitors and Utilization ------------------------------------------------------------------------ 7 3. Conservation and Management -------------------------------------------------------------- 7 3.1 Measures for Conservation ----------------------------------------------------------------- 7 3.1.1 Landscape Protection Agreement ----------------------------------------------------- 7 3.1.2 Beautification Activities------------------------------------------------------------------- 8 3.1.3 Green Worker Program -
Final Rule to List the Short-Tailed Albatross As Endangered
Federal Register / Vol. 65, No. 147 / Monday, July 31, 2000 / Rules and Regulations 46643 Issued on: July 25, 2000. DEPARTMENT OF THE INTERIOR ACTION: Final rule. Rosalyn G. Millman, Fish and Wildlife Service SUMMARY: Under the authority of the Deputy Administrator. Endangered Species Act (Act) of 1973, [FR Doc. 00±19123 Filed 7±25±00; 5:00 pm] 50 CFR Part 17 as amended, we, the U.S. Fish and BILLING CODE 4910±59±C Wildlife Service (Service), extend endangered status for the short-tailed RIN 1018±AE91 albatross (Phoebastria albatrus) to Endangered and Threatened Wildlife include the species' range within the and Plants; Final Rule To List the United States. As a result of an Short-Tailed Albatross as Endangered administrative error in the original in the United States listing, the short-tailed albatross is currently listed as endangered AGENCY: Fish and Wildlife Service, throughout its range except in the Interior. United States. Short-tailed albatrosses VerDate 11<MAY>2000 18:38 Jul 28, 2000 Jkt 190000 PO 00000 Frm 00077 Fmt 4700 Sfmt 4700 E:\FR\FM\31JYR1.SGM pfrm11 PsN: 31JYR1 46644 Federal Register / Vol. 65, No. 147 / Monday, July 31, 2000 / Rules and Regulations range throughout the North Pacific short-tailed albatross, the Laysan because high numbers of birds were Ocean and north into the Bering Sea albatross (P. immutabilis), the black- seen nearshore during the summer and during the nonbreeding season; footed albatross (P. nigripes), and the fall months (Yesner 1976). Alaska Aleut breeding colonies are limited to two waved albatross (P. irrorata)(AOU lore referred to local breeding birds, and Japanese islands, Torishima and 1998). -
Monitoring of Nishinoshima Volcano from Space
SVC45-P15 Room:Convention Hall Time:May 27 18:15-19:30 Monitoring of Nishinoshima volcano from space FUKUI, Keiichi1¤ ; SAKURAI, Toshiyuki2 ; ANDO, Shinobu3 1VolcanologyResearch Department, Meteorological Research Institute, 2Tokyo VAAC, Japan Meteorological Agency, 3Seismology and Tsunami Research Department, Meteorological Research Institute The eruption column was discovered near Nishinoshima, Ogasawara islands, Japan on November 20, 2013 by the aircraft of Japan Maritime Self-Defense Force, and a new islet was confirmed by Japan Coast Guard on the same day. The new island continues growing up with lava flows for more than a year. For monitoring of volcanic activity of Nishinoshima, Japan Coast Guard and the Self-Defense Forces carry out the aerial observations at least once a month (a few times a month until March 2014). The changes of the area of island, position of crater, land form, eruption style, and discolored seawater are investigated from these observations. Also, aerial survey of 5 times was carried until January 2014 by the Geospatial Information Authority of Japan. In addition, Earthquake Research Institute estimated temporal change of the effusion rates from TerraSAR-X images and aerial photos taken by JCG and others. Various data is acquired periodically from space. In particular, the data of Earth observation satellites such as LANDSAT-8 has quickly become available through internet at no charge. Thermal activity and the feature of ground surface of Nishinoshima volcano were estimated with following satellite images. 1) Heat discharge rates were evaluated from plume rise method (Kagiyama, 1978) by using images of panchromatic band of LANDSAT-8/OLI and EO-1/ALI, and visible band of Terra/ASTER. -
Asia and Japan: Perspectives of History a Symposium Record
Asia and Japan: Perspectives of History A Symposium Record Editors Gyongsu MUN and Yasushi KOSUGI Asia-Japan Research Institute Ritsumeikan University AJI BOOKS Asia and Japan: Perspectives of History A Symposium Record Editors Gyongsu MUN and Yasushi KOSUGI Asia-Japan Research Institute Ritsumeikan University ISBN 978-4-9911356-0-6 (Online) ISBN 978-4-9911356-1-3 (Print) Asia and Japan: Perspectives of History AJI Editorial Office OIC Research Office, Ritsumeikan University Osaka Ibaraki Campus (OIC) 2-150 Iwakura-cho, Ibaraki, Osaka 567-8570 JAPAN Email: [email protected] Copyright © 2021 Asia-Japan Research Institute, Ritsumeikan University Note: Authors’ names in this publication are ordered according to their preference and their surnames are capitalized. Contents Editors’ Preface Gyongsu MUN, Yasushi KOSUGI ................................. v Participants’ Profiles .................................................... 1 Session 1 Keynote Speech: The Afterlife of History and the Importance of Seeing Japan from the Sea Professor Alexis DUDDEN 1. Introduction ....................................................................... 4 2. LDP’s April 2012 Draft Constitution ................................. 6 3. World View from Japan ......................................................9 4. Okinawa ........................................................................... 1 1 5. “People Doing”: Nature and Ogasawara .......................... 1 8 6. Shimizu Ryoichi .............................................................. 2 -
Guidelines for Privately Protected Areas Guidelines for Privately Protected Areas Brent A
Guidelines for privately protected areas Guidelines for privately protected Guidelines for privately protected areas Brent A. Mitchell, Sue Stolton, Juan Bezaury-Creel, Heather C. Bingham, Tracey L. Cumming, Nigel Dudley, James A. Fitzsimons, Delphine Malleret-King, Kent H. Redford and Pedro Solano Craig Groves, Series Editor Best Practice Protected Area Guidelines Series No. 29 IUCN WCPA’s BEST PRACTICE PROTECTED AREA GUIDELINES SERIES IUCN-WCPA’s Best Practice Protected Area Guidelines are the world’s authoritative resource for protected area managers. Involving collaboration among specialist practitioners dedicated to supporting better implementation of ideas in the field, the Guidelines distil learning and advice drawn from across IUCN. Applied in the field, they build institutional and individual capacity to manage protected area systems effectively, equitably and sustainably, and to cope with the myriad of challenges faced in practice. The Guidelines also assist national governments, protected area agencies, non-governmental organisations, communities and private sector partners in meeting their commitments and goals, and especially the Convention on Biological Diversity’s Programme of Work on Protected Areas. A full set of guidelines is available at: www.iucn.org/pa_guidelines Complementary resources are available at: www.cbd.int/protected/tools/ Contribute to developing capacity for a Protected Planet at: www.protectedplanet.net/ IUCN PROTECTED AREA DEFINITION, MANAGEMENT CATEGORIES AND GOVERNANCE TYPES IUCN defines a protected area as: A clearly defined geographical space, recognised, dedicated and managed, through legal or other effective means, to achieve the long-term conservation of nature with associated ecosystem services and cultural values. The definition is expanded by six management categories (one with a sub-division), summarized below. -
Ogasawara Islands, Japan
WORLD HERITAGE FACT SHEET Ogasawara Islands, Japan Key facts • Recommended by IUCN for inscription on the World Heritage List in June 2011 at the World Heritage Committee in Paris, France as an outstanding example of on-going evolutionary processes in an oceanic island ecosystem. • The Ogasawara Islands are located in the northwestern Pacific Ocean roughly 1,000 km south of the main Japanese Archipelago. The serial nomination is comprised of five components consisting of 30 islands spread over 400 square kilometres. The site is clustered within three island groups of the Ogasawara Archipelago: Mukojima, Chichijima and Hahajima, plus an additional three individual islands: Kita-iwoto and Minami-iwoto of the Kazan group and the isolated Nishinoshima Island. • Marine areas within the Ogasawara Islands National Park are home to significant populations of dolphins, whales and turtles. • The Ogasawara Islands provide valuable evidence of evolutionary processes through active ecological processes of adaptive radiation in the evolution of the land snail fauna and endemic plant species. Key quote “The remoteness of the Ogasawara Islands has allowed animals and plants to evolve practically undisturbed in the Islands,” says Peter Shadie, Deputy Head of IUCN’s Delegation. “The Ogasawara Islands tell a unique story of how an oceanic island arc is born and how it evolved to its present form as an important habitat for rare and endangered species.” Media contact • Borjana Pervan, IUCN Media Relations, t +41 22 999 0115, m +41 79 857 4072 , e [email protected] Photos: For photos of the Ogasawara Islands, please visit: http://iucn.org/knowledge/news/focus/world_heritage/photos/ The images are copyright protected and can only be used to illustrate press releases in relation to IUCN’s recommendations to the World Heritage Committee.