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Three‐dimensional distributions of S wave reflectors in the source region of the 2000 Western Tottori Earthquake
Author(s) -
Doi Issei,
Nishigami Kin'ya
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031169
Subject(s) - geology , seismology , aftershock , classification of discontinuities , perpendicular , reflection (computer programming) , waveform , crust , fault (geology) , fault plane , geodesy , plane (geometry) , geophysics , geometry , physics , mathematical analysis , mathematics , quantum mechanics , voltage , computer science , programming language
We conducted a reflection analysis of the aftershock waveforms in the source region of the 2000 Western Tottori Earthquake. We obtained three‐dimensional distributions of S wave reflectors in the source region by using ∼9000 waveform traces. In the cross‐section projected along the mainshock fault plane, we found three major reflection zones at depths of 15–25 km, 30–40 km and 50–60 km. The first and second are thought to correspond to the Conrad and the Moho discontinuities. The depth of these reflective zones seems to change along the fault direction. Also, cross‐sections perpendicular to the fault plane show that the strengths of the reflected waves are different between the two sides of the fault plane. This result suggests that the mainshock fault plane is located at the boundary of medium properties and its near‐vertical downward extension in the lower crust.