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Classifying Missing Seismic Sources Offshore of Southeast Japan

Description: 

The offshore region of southeast Japan experiences a broad range of slip phenomena from regular earthquakes to slow earthquakes and submarine landslides. Identifying these slip phenomena can help infer the evolution of fault zone environments, and identifying their interactions with megathrust earthquakes can provide insights into earthquake nucleation processes. Here we systematically detect, locate, model and classify offshore seismic sources in southeast Japan between 2006 and 2016 which emit coherent surface wave packets in the 20-50 s period. We apply our surface wave detector to the ~ 700 Hi-net high-sensitivity accelerometers and will model the sources using ~76 F-net broadband seismometers. We will further classify the events by their high to low frequency content. Our procedure makes no assumptions about the source type and has previously been used to detect a range of slip phenomena including regular earthquakes, very low frequency earthquakes, and submarine landslides. Further, the method was previously used to identify many events offshore of the Japan trench which occur both landward and seaward of the trench and have diverse origins. We plan to detect and locate missing events in the Nankai trough, Ryukyu trench and the outer rise region. By modelling and comparatively evaluating these events, we will identify their statistical characteristics in the region.

Session: SSJ-SSOC-SSA Joint Session: From Slow to Fast Earthquakes: Bridging the Spectrum of Fault Slip [Poster]

Type: Poster

Date: 4/16/2026

Presentation Time: 08:00 AM (local time)

Presenting Author: Harrison J. Burnett

Student Presenter: Yes

Invited Presentation: 

Poster Number: 142

Authors