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Deep Transient Deformation and Long-Distance Along-Slab Stress Interactions: The 2013 Seismic Activity and Slow Deformation Beneath Kamchatka and Okhotsk Sea.

Description: 

The discovery of slow slip events on subduction planes have triggered a new interest to deformation transients with time scale between regular earthquake and plate motion. The studies of initiation of large earthquakes are focused on frictional instabilities occurring in the near vicinity of the future rupture. Contributions of deeper transients and of long-distance interactions remain unknown. Here we analyze seismic catalogs and geodetic time series during a few months preceding the 2013 M = 8.3 deep-focus Okhotsk earthquake. This deep-focus event is preceded by four intense seismic clusters in the seismogenic zone. GNSS time series in Kamchatka revealed a transient landward motion episode one month prior to the mainshock, consistent with an increase of seismogenic zone loading. This transient loading episode is accompanied by a doubling of the intermediate depth seismicity rate suggesting a transient slab pull as the origin. These observations question the constant subducting velocity hypotheses and may have implications in the understanding of the long-distance along-slab stress interactions and in their contribution to initiation of large earthquakes, including deep-focus and shallow subduction events.

Session: From Earthquakes to Plate Boundaries: Insights Into Fault Behavior Spanning Seconds to Millennia

Type: Oral

Date: 4/20/2023

Presentation Time: 03:00 PM (local time)

Presenting Author: Michel Campillo

Student Presenter: No

Invited Presentation: 

Authors