論文

査読有り
2017年

Muography of 1949 fault in La Palma, Canary Islands, Spain

ANNALS OF GEOPHYSICS
  • Seigo Miyamoto
  • ,
  • Jose Barrancos
  • ,
  • Cristiano Bozza
  • ,
  • Lucia Consiglio
  • ,
  • Chiara De Sio
  • ,
  • Pedro Hernandez
  • ,
  • Ryuichi Nishiyama
  • ,
  • German Padilla
  • ,
  • Eleazar Padron
  • ,
  • Chiara Sirignano
  • ,
  • Simona Maria Stellacci
  • ,
  • Hiroyuki K. M. Tanaka
  • ,
  • Valeri Tioukov

60
1
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.4401/ag-7385
出版者・発行元
IST NAZIONALE DI GEOFISICA E VULCANOLOGIA

Muography (muon radiography) is a new geophysical technique that allows investigation of inner structures of an edifice with a very detailed spatial resolution. It has been recently used for several volcanoes and different geoscientific targets. In 2011 Tanaka et al. succeeded to find hidden ancient seismic faults. In 1949 there was a volcanic activity of the Cumbre Vieja, La Palma, Canary Islands, Spain and a 1km-long fault suddenly appeared during the active period. The fault might be the sign of a large scale land collapse. In order to get additional information, investigations by several geophysical exploration techniques are needed. We consider that muography can be applied to study the shallow part of the fault and it can clarify some important parameters: the bulk density, the width of the low density zone, and the depth. Previous investigations allowed detecting two ancient seismic faults that have 20m-wide mechanically fractured zone consisting of highly damaged rocks. The 1949 fault might be the result of large scale land slide and the slide length might be just a few meter. Therefore the expected width of the fault is only a few meter. In order to detect such narrow fault, the muon detector should have as high spatial resolution as possible. In addition, it is difficult to get continuous power supply near the fault. Nuclear emulsions are a kind of photographic films that have high sensitivity for high energy charged particles. They also have high spatial resolution for high energy muon paths and do not need any power supply to be operated. We placed an emulsion detector having 0.19 m(2) effective area near the 1949 fault. The exposure started on January 2014 and lasted 106 days. All the emulsion films were developed and they are under analysis. We also estimated the expected performance of this test exposure. Assuming a very simple model, we evaluated the detectable region as a function of the low density zone width and of the depth from the ground surface as well.

Web of Science ® 被引用回数 : 3

リンク情報
DOI
https://doi.org/10.4401/ag-7385
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000408568000010&DestApp=WOS_CPL
ID情報
  • DOI : 10.4401/ag-7385
  • ISSN : 1593-5213
  • eISSN : 2037-416X
  • Web of Science ID : WOS:000408568000010

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