TY - JOUR
T1 - Source Characteristics and Along-Strike Variations of Shallow Very Low Frequency Earthquake Swarms on the Nankai Trough Shallow Plate Boundary
AU - Takemura, Shunsuke
AU - Baba, Satoru
AU - Yabe, Suguru
AU - Emoto, Kentaro
AU - Shiomi, Katsuhiko
AU - Matsuzawa, Takanori
N1 - Funding Information:
Numerical simulations for evaluating the Green's functions were conducted using the Fujitsu PRIMERGY CX600M1/CX1640M1 (Oakforest‐PAC) at the Information Technology Center, University of Tokyo. This study was supported by a JSPS KAKENHI Grant‐in‐Aid for Scientific Research (C), grant number JP21K03696, and a Grant‐in‐Aid for Scientific Research on Transformative Research Areas “Science of Slow‐to‐Fast earthquakes,” grant numbers JP21H05200, JP21H05203, JP21H05205, and JP21H05206. This study was also supported by ERI JURP 2021‐S‐B102, which provided the computational resources for calculating the Green's functions. We also acknowledge Dr. Baoning Wu, an anonymous reviewer and editor Prof. Germán Prieto, for careful reviewing and constructive comments, which helped to improve the manuscript.
Publisher Copyright:
© 2022. The Authors.
PY - 2022/6/16
Y1 - 2022/6/16
N2 - We detected shallow very low frequency earthquakes (VLFEs) off the Cape Muroto and Kii Channel in the Nankai subduction zone and estimated their moment rate functions. Combining the new and previously estimated catalogs, we obtained the comprehensive catalog of shallow VLFE moment rate functions along the Nankai Trough. We defined the shallow VLFE swarms and investigated the scaling relationships of their cumulative moments, activity area, and durations in each region. Detected swarms were considered candidates for shallow slow slip events. A similar scaling relationship was observed between the cumulative moments and activity areas, irrespective of regions. It indicates similar stress drops in each region. However, the relationship between the cumulative moments and durations varied. This difference was explained by the along-strike variations in the faulting conditions of shallow slow earthquakes, such as material or hydrological properties.
AB - We detected shallow very low frequency earthquakes (VLFEs) off the Cape Muroto and Kii Channel in the Nankai subduction zone and estimated their moment rate functions. Combining the new and previously estimated catalogs, we obtained the comprehensive catalog of shallow VLFE moment rate functions along the Nankai Trough. We defined the shallow VLFE swarms and investigated the scaling relationships of their cumulative moments, activity area, and durations in each region. Detected swarms were considered candidates for shallow slow slip events. A similar scaling relationship was observed between the cumulative moments and activity areas, irrespective of regions. It indicates similar stress drops in each region. However, the relationship between the cumulative moments and durations varied. This difference was explained by the along-strike variations in the faulting conditions of shallow slow earthquakes, such as material or hydrological properties.
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U2 - 10.1029/2022GL097979
DO - 10.1029/2022GL097979
M3 - Article
AN - SCOPUS:85132036804
SN - 0094-8276
VL - 49
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 11
M1 - e2022GL097979
ER -