Source parameters and radiation efficiency for intermediate-depth earthquakes in Northeast Japan

Source parameters and radiation efficiency for intermediate-depth earthquakes in Northeast Japan

Nishitsuji, Y.
Mori, J.

Civil Engineering and Geosciences

Geoscience & Engineering

2013-12-05

We estimated source parameters of 216 intermediate-depth (65–150 km) earthquakes (Mw 4.0–7.0) in the Pacific slab beneath Japan along using Hi-net data. We made determinations of static stress drop, radiated energy and radiation efficiency, along with estimates of the whole path attenuation, to study the source scaling as a function of earthquake size and depth. Our results show that there is a small increase in the values of the ratio of radiated energy to seismicmoment, as a function of seismic moment, which is due to an associated slight increase of static stress drop with earthquake size. We also estimated the radiation efficiency for these events using the static stress drops and radiated energies. The values of radiation efficiency are slightly lower compared to shallow crustal earthquakes. These results indicate that dissipative energy processes may be relatively more important for intermediate-depth earthquakes.

body waves
earthquake source observations
statistical seismology

http://resolver.tudelft.nl/uuid:02959505-62b7-4acb-a669-8b954f011307

https://doi.org/10.1093/gji/ggt458

Oxford University Press

0956-540X

Geophysical Journal International, 196 (2), 2014

Institutional Repository

journal article

(c) 2013 The Author(s)