Hypocenter distribution of the main- and aftershocks of the 2005 Off Miyagi Prefecture earthquake located by ocean bottom seismographic data

Ryota Hino, Yojiro Yamamoto, Asako Kuwano, Minoru Nishino, Toshihiko Kanazawa, Tomoaki Tamada, Kazuo Nakahigashi, Kimihiro Mochizuki, Masanao Shinohara, Kouetsu Minato, Gen Aoki, Nariaki Okawara, Masayuki Tanaka, Masao Abe, Eiichiro Araki, Shuichi Kodaira, Gou Fujie, Yoshiyuki Kaneda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The preliminary hypocenter distribution of the 2005 Off Miyagi Prefecture earthquake and its aftershocks is estimated using data from five ocean bottom and six onshore seismic stations located around the rupture area of the earthquake. The epicenter of the mainshock is relocated at 38.17°N, 142.18°E, and the focal depth is estimated to be 37.5 km. The aftershocks surrounding the mainshock hypocenter form several clusters that are concentrated along a distinct landward dipping plane corresponding to the plate boundary imaged by the previous seismic experiment. The strike and dip angles of the plane agree well with those of the focal mechanism solution of the mainshock. The size of the plane is about 20×25 km2 in the strike and dip directions, which is similar to that of the large coseismic slip area. The up-dip end of the planar distribution of the aftershocks corresponds to the bending point of the subducting oceanic plate, suggesting that the geometry of the plate boundary affects the spatial extent of the asperity of the 2005 earthquake.

Original languageEnglish
Pages (from-to)1543-1548
Number of pages6
Journalearth, planets and space
Volume58
Issue number12
DOIs
Publication statusPublished - 2006

Keywords

  • Interplate seismicity
  • Ocean bottom seismographs
  • Off Miyagi Prefecture earthquake

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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