Work Description

Title: Stress drop variation of deep-focus earthquakes tables Open Access Deposited

http://creativecommons.org/publicdomain/zero/1.0/
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Methodology
  • The seismograms we used were downloaded from Incorporated Research Institutions for Seismology Data Manage Center (IRIS DMC). We then used a spectral method based on empirical Green's function to obtain corner frequencies of deep-focus earthquakes using these seismograms. Finally, we computed stress drops from corner frequencies assuming Brune's source model and a circular crack.
Description
  • We intend to figure out the difference of stress drops, which is a characteristic source parameter, between shallow and deep-focus earthquakes. Significant stress drop difference may shed light on the difference of physical mechanisms of shallow and deep-focus earthquakes, which has been a elusive question. We select from deep-focus earthquakes (> 400 km) in 2000-2018 and obtain their stress drops using P and S waves. We find that stress drops of deep-focus earthquakes are about one order of magnitude higher than that of shallow earthquakes, indicating about one order of magnitude higher shear strength of shallow faults than faults in the mantle. The wide range of stress drops further suggests coexistence of phase transformation and shear-induced melting mechanisms of deep-focus earthquakes.
Creator
Depositor
  • meichenl@umich.edu
Contact information
Discipline
Funding agency
  • National Science Foundation (NSF)
Citations to related material
Resource type
Last modified
  • 11/21/2019
Published
  • 11/21/2019
Language
DOI
License
To Cite this Work:
Liu, M. (2019). Stress drop variation of deep-focus earthquakes tables [Data set]. University of Michigan - Deep Blue. https://doi.org/10.7302/sp05-y333

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