Moho depth variation in the central part of Northeastern Japan estimated from reflected and converted waves

Junichi Nakajima, Toru Matsuzawa, Akira Hasegawa

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

We detected reflected P- and S-waves at the Moho in seismograms of shallow crustal earthquakes in the central part of northeastern (NE) Japan. P-to-S and S-to-P mode-converted waves at the Moho are also detected in seismograms of intermediate-depth earthquakes in the subducted Pacific slab. The depth distribution of the Moho in the central part of NE Japan is estimated by using travel time differences between these later phases and the first P and S arrivals. We collected travel time data of 496 reflected waves from 67 shallow earthquakes and 200 converted waves from 65 intermediate-depth earthquakes. The depth to the Moho estimated is deep beneath the land and becomes shallower toward the eastern and western coastlines. The Moho depth is about 34 km in the middle of the land area, about 30 km under the coastline of the Japan Sea and 27-29 km under the coastline of the Pacific Ocean.

Original languageEnglish
Pages (from-to)31-47
Number of pages17
JournalPhysics of the Earth and Planetary Interiors
Volume130
Issue number1-2
DOIs
Publication statusPublished - 2002 Apr 16

Keywords

  • Converted wave
  • Moho discontinuity
  • Northeastern Japan
  • Reflected wave

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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