Journal of Geography (Chigaku Zasshi)
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
Cover
Polarities of First P Wave Arrivals Observed with the 0.1 Manten Hyper Dense Seismic Network Deployed in the Aftershock Area of the 2000 Western Tottori Earthquake
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2020 Volume 129 Issue 4 Pages Cover04_01-Cover04_02

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Abstract

 Thousand seismometers had been deployed in the aftershock area of the 2000 Western Tottori earthquake (Mj 7.3) from March 2017 to April 2018. Map shows first P wave polarity distribution for an event that occurred on October 21, 2017 with a magnitude of 3.0. Yellow star shows epicenter. Blue and red dots, plotted at sensor sites, indicate polarity up and down, respectively. Small dots indicate stations with polarity unrecognized. Open star shows epicenter of the mainshock of the Mj 7.3 event. Open squares are locations of Hi-net stations. Polarity distribution is clearly divided into four quadrants, demonstrating that the event is of the strike-slip type.

Acknowledgements

 We used topographic map by Geospatial Information Authority of Japan.

(Satoshi MATSUMOTO)

© 2020 Tokyo Geographical Society
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