地学雑誌 | Journal of Geography (Chigaku Zasshi)

2020 Vol.129 No.4

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

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)

Special Issue: Crustal Dynamics (Part II):
Toward the Integration of Geology and Geophysics

Overview of the Special Issue
　“Crustal Dynamics (Part II): Toward the Integration of Geology and Geophysics”

Yukitoshi FUKAHATA, Youichiro TAKADA,
Kiyokazu OOHASHI and Akiko TANAKA

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 443.

DOI:10.5026/jgeography.129.443

Introduction to the Special Issue
　“Crustal Dynamics (Part II): Toward the Integration of Geology and Geophysics”

Yukitoshi FUKAHATA, Youichiro TAKADA,
Kiyokazu OOHASHI and Akiko TANAKA

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 447.

DOI:10.5026/jgeography.129.447

Heterogeneity of Stress Field in NE Japan and Implications
　for Fault Strength and Earthquake Occurrence Mechanism (Review Article)

Keisuke YOSHIDA and Toru MATSUZAWA

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 451.

DOI:10.5026/jgeography.129.451

Evolution of Fault Zones and Its Rheology (Review Article)

Kiyokazu OOHASHI, Toru TAKESHITA and Ken-ichi HIRAUCHI

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 473.

DOI:10.5026/jgeography.129.473

Dynamic Earthquake Cycle Simulations Considering Changes
　in Dominant Deformation Mechanisms of a Fault Slip (Review Article)

Hiroyuki NODA

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 491.

DOI:10.5026/jgeography.129.491

Hyper Dense Seismic Observation for Investigation on Fault Zone Development:
　Application to Hypocentral Area of 2000 Western Tottori Earthquake
　(Review Article)

Satoshi MATSUMOTO, Yoshihisa IIO, Shinichi SAKAI,
Aitaro KATO and Group for “0.1 Manten” Hyper Dense Seismic Observation

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 511.

DOI:10.5026/jgeography.129.511

Late Cenozoic Igneous Activity and Crustal Structure in the NE Japan Arc:
　Background of Inland Earthquake Activity (Review Article)

Takeyoshi YOSHIDA, Reishi TAKASHIMA, Takeshi KUDO,
Oky Dicky Ardiansyah PRIMA, Sumire MAEDA, Keisuke YOSHIDA,
Tomomi OKADA, Satoshi MIURA, Tomohiro TAKAHASHI,
Yoshitaka NAGAHASHI and Kyoko KATAOKA

Journal of Geography (Chigaku Zasshi), 2020, 129(4), 529.

DOI:10.5026/jgeography.129.529