4.6 Article

Aftershock productivity of intermediate-depth earthquakes in Japan

Journal

GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 230, Issue 1, Pages 448-463

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/gji/ggac024

Keywords

Earthquake source observations; Seismicity and tectonics; Subduction zone processes; Intra-plate processes; Statistical seismology; Japan

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The study finds that productive aftershock sequences of intermediate-depth earthquakes behave similarly to those of crustal earthquakes and tend to appear mainly in the Pacific Plate, where they are significantly correlated with along-strike variations in V-P-V-S ratio, suggesting a role for fluids in enabling intermediate-depth aftershock activity.
Intermediate-depth earthquakes occur at temperatures and pressures thought to prohibit brittle fracture and are deficient in aftershocks compared to shallow earthquakes. We search for aftershock sequences of M > 5.5 intermediate-depth earthquakes in two subducting slabs under Japan, and perform a statistical analysis to see if variations in aftershock productivity can be linked to slab properties. Our study regions are the older, colder and steeper Pacific Plate and the younger, warmer, shallower Philippine Sea Plate. We find that productive aftershock sequences behave similarly to those of crustal earthquakes and tend to appear mainly in the Pacific Plate where they are significantly correlated with along-strike variations in V-P-V-S ratio, suggesting a role for fluids in enabling intermediate-depth aftershock activity.

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