Change in area strain around Toyama prefecture, Japan, during the period of 2005-2020
Abstract
Change in area strain in and around Toyama prefecture during the period of 2005-2020 was examined. Final solutions of F3 daily coordinate data from GNSS Earth Observation Network System (GEONET) stations in and around Toyama prefecture (25 stations; operated by Geological Information Authority of Japan) were used. Triangulation of these stations was performed by the TRIANGULATE command of GMT (Wessel and Smith, 1998). Change in area strain within each triangle during the period from October 2006-October 2019 was (and additional one-year period to October 2020 will be) investigated.The founding was as follows: (1) Extension in Toyama bay caused by Noto Hanto earthquake in 2007 was still continuing as of at least 2019, and the amount of extension is approximately 4 ppm. (2) 1-2 ppm extension of whole Toyama was detected except around northwest area where contraction was detected in 2011 when the Great East Japan earthquake and earthquake swarms in east Toyama was occurred in March and October, respectively. (3) After the Kamishiro fault earthquake occurred in November 2014 which caused large strain changes of approximately 9 ppm extension around east to southeast area of Toyama prefecture, contraction detected around northwest area started to proceed. (4) Extension of approximately 0.5 ppm and the following contraction of approximately 0.4 ppm around Midagahara volcano were found when active fumarole activities started in 2012.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMG021.0008H
- Keywords:
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- 1209 Tectonic deformation;
- GEODESY AND GRAVITY;
- 1240 Satellite geodesy: results;
- GEODESY AND GRAVITY;
- 4302 Geological;
- NATURAL HAZARDS;
- 8107 Continental neotectonics;
- TECTONOPHYSICS