Depth dependence of rupture velocity in deep earthquakes

Explaining deep seismicity is a long‐standing challenge in earth science. Between 300 and 700 km depth, earthquakes are scarce except between ∼530 and ∼600 km, where the majority of events occur. By imaging the seismic rupture process for a set of recent deep earthquakes using the back projection of...

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Published in:Geophysical research letters 2011-03, Vol.38 (5), p.np-n/a
Main Authors: Suzuki, Mitsuru, Yagi, Yuji
Format: Article
Language:English
Subjects:
back-projection
Continental dynamics
Crack propagation
deep earthquakes
Dynamics
Earth sciences
Earth, ocean, space
Earthquakes
Exact sciences and technology
Projection
Rupture
rupture velocity
Seismic activity
Seismic phenomena
Seismicity
Seismology
Sound waves
Wave velocity
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Yagi, Yuji
description Explaining deep seismicity is a long‐standing challenge in earth science. Between 300 and 700 km depth, earthquakes are scarce except between ∼530 and ∼600 km, where the majority of events occur. By imaging the seismic rupture process for a set of recent deep earthquakes using the back projection of teleseismic P‐waves, we found that the rupture velocities are less than 60% of the shear wave velocity except in the depth range of 530 to 610 km. We propose that large fracture surface energy (Gc) values for deep earthquakes generally prevent the acceleration of dynamic rupture propagation and generation of earthquakes between 300 and 700 km depth, whereas small Gc value in the exceptional depth range promote dynamic rupture propagation and explain the seismicity peak near 600 km.
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source Wiley-Blackwell AGU Digital Library
subjects back-projection
Continental dynamics
Crack propagation
deep earthquakes
Dynamics
Earth sciences
Earth, ocean, space
Earthquakes
Exact sciences and technology
Projection
Rupture
rupture velocity
Seismic activity
Seismic phenomena
Seismicity
Seismology
Sound waves
Wave velocity
title Depth dependence of rupture velocity in deep earthquakes
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