Examining the connections between earthquake swarms, crustal fluids, and large earthquakes in the context of the 2020-2024 Noto Peninsula, Japan, earthquake sequence
Geophysical Research Letters
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Abstract
Earthquake swarms are most commonly composed of small-magnitude earthquakes – those that may in some cases be felt but without causing damage. However, a recent study by Yoshida et al. (2023, https://doi.org/10.1029/2023GL106023) analyzed a swarm beneath the Noto Peninsula in Japan that, after more than two years of moderate-magnitude seismicity, triggered the moment magnitude (Mw) 6.2 Suza mainshock. Based on high-precision earthquake locations and a slip inversion of the mainshock, these authors found that the Mw 6.2 Suza earthquake occurred on the updip extension of a fault that was active during the swarm, likely driven by fluid pressure perturbations. After publication of that paper, a much larger and more destructive Mw 7.5 event occurred nearby. These events underscore the potential for swarms to be precursors to large, damaging earthquakes. Forecasting the eventual evolution of swarms is currently very challenging but could be aided in the future by new observations and models.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Examining the connections between earthquake swarms, crustal fluids, and large earthquakes in the context of the 2020-2024 Noto Peninsula, Japan, earthquake sequence |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2023GL107897 |
| Volume | 51 |
| Issue | 4 |
| Publication Date | February 24, 2024 |
| Year Published | 2024 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Geologic Hazards Science Center - Seismology / Geomagnetism |
| Description | e2023GL107897, 4 p. |
| Country | Japan |
| Other Geospatial | Noto Peninsula |