Implications of Fault‐Valve Behavior From Immediate Aftershocks Following the 2023 Mj6.5 Earthquake Beneath the Noto Peninsula, Central Japan

Kato, Aitaro

doi:10.1029/2023gl106444

Cited by 43 publications

(10 citation statements)

References 41 publications

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“…1). The 2023 M 6.5 event, which occurred in the northern tip of the peninsula, was preceded by the long lived earthquake swarms from early November 2020 (Amezawa et al, 2023;Yoshida, Uno, et al, 2023;Yoshida, Uchida, et al, 2023;Kato, 2024;Shelly, 2024). Geodetic analyses suggest a series of transient aseismic to seismic deformation from deep to shallow domains, that is aseismic deformation caused by fluid spreading from depth, which triggered up-dip earthquake swarm activity (Nishimura et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

A Multiplex Rupture Sequence under Complex Fault Network due to Preceding Earthquake Swarms during the 2024 Mw 7.5 Noto Peninsula, Japan, Earthquake

Okuwaki,

Yagi,

Murakami

et al. 2024

Preprint

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A devastating earthquake with moment magnitude 7.5 occurred in the Noto Peninsula, central Japan. We estimate the rupture evolution of this earthquake from teleseismic P-wave data using the potency-density tensor inversion method, which can give spatiotemporal slip distribution including the information on fault orientations. The result shows a long and quiet initial rupture phase, which overlaps the regions of the preceding earthquake swarms and the associated aseismic deformation. The following three major rupture episodes evolve on segmented, differently oriented faults, which are bounded by the initial rupture region. The irregular initial rupture process followed by the multi-scale rupture growth are considered to be controlled by the preceding seismic and aseismic processes and the geometric complexity of fault system. Such a discrete rupture scenario, including the triggering of an isolated fault rupture, add critical inputs on the assessment of strong ground motion and associated damages for future earthquakes.

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Section: Introductionmentioning

confidence: 99%

A Multiplex Rupture Sequence under Complex Fault Network due to Preceding Earthquake Swarms during the 2024 Mw 7.5 Noto Peninsula, Japan, Earthquake

Okuwaki,

Yagi,

Murakami

et al. 2024

Preprint

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“…The swarm activity was confined in a small region (~ 20 km × ~ 10 km) at the tip of the peninsula, and has been considered to be related to upwelling fluid (Nishimura et al 2023). On May 5, 2023, a larger earthquake (M JMA 6.5) occurred (Kato 2024), and the area of swarm activity became larger (30 km × 30 km, according to Earthquake Research Committee, https:// www. static.…”

Section: Introductionmentioning

confidence: 99%

Slip distribution of the 2024 Noto Peninsula earthquake (MJMA 7.6) estimated from tsunami waveforms and GNSS data

Fujii,

Satake

2024

Earth Planets Space

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The 1 January 2024 Noto-Hanto (Noto Peninsula) earthquake (MJMA 7.6) generated strong ground motion, large crustal deformation and tsunamis that caused significant damage in the region. Around Noto Peninsula, both offshore submarine and partially inland active faults have been identified by previous projects: Ministry of Land, Infrastructure, Transport and Tourism (MLIT) and Japan Sea Earthquake and Tsunami Research Project (JSPJ). We inverted the tsunami waveforms recorded on 6 wave gauges and 12 tide gauges around Sea of Japan and the GNSS data recorded at 53 stations in Noto Peninsula to estimate the slip amount and seismic moment on each of active faults. The results show that the 2024 coseismic slips were 3.5 m, 3.2 m, and 3.2 m on subfaults NT4, NT5 and NT6 of the JSPJ model, located on the northern coast of Noto Peninsula and dipping toward southeast. A smaller slip, 1.0 m, estimated on NT8 on the southwestern end of the 2024 rupture, may be attributed to its previous rupture during the 2007 Noto earthquake. The total length of these four faults is ~ 100 km, and the seismic moment is 1.90 × 1020 Nm (Mw = 7.5). Almost no slip was estimated on the northeastern subfaults NT2 and NT3, which dip northwestward, opposite to NT4–NT5–NT6, and western subfault NT8. Aftershocks including the MJMA 6.1 event occurred in the NT2–NT3 region, but they are smaller than the potential magnitude (Mw 7.1) those faults can release in a tsunamigenic earthquake. Similar features are also found for the MLIT model; the 2024 slip was only on F43 along the northern coast of Noto Peninsula, and northeastern F42 did not rupture, leaving potential for future event. Graphical Abstract

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“…(5) The communication infrastructure, including mobile phone networks, was disrupted; earthquake and tsunami meters were not functioning; and tsunami information was not accurately captured (delays in grasping the damage information). ( 6) People are accustomed to earthquakes, and there is a lack of earthquake damage estimation due to the Noto earthquake swarm since December 2020 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Initial response to the 2024 Noto earthquake by the university hospital closest to the disaster area

Uramoto,

Shimasaki,

Sasaki

et al. 2024

Preprint

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Major earthquakes have occurred frequently in Japan throughout the course of history, and the 2024 Noto earthquake was no exception. However, such natural disasters do differ in some respects, and specific problems related to these events have also become clear. Our hospital, which was the closest university hospital to the disaster area of the 2024 Noto earthquake, is playing a crucial role in serving the local community in the wake of the earthquake. The first method used to identify disaster-related patients was to tag them when they were examined by a physician. After confirming that a patient was eligible at the disaster-related patient-determination meeting, the patients’ medical information was extracted from the tag name. A total of 421 disaster-related patients were transported and hospitalized by day 31. Fifty-two (14.4%) and 48 (13.3%) patients were admitted for orthopedic surgery and respiratory medicine, respectively. Forty (11.1%) and 38 (10.5%) patients were admitted to the cardiology and nephrology departments, respectively. These four departments accounted for 49.3% of the total. The number of hospitalized patients in the nephrology and orthopedic surgery departments was high immediately after the earthquake. We also describe new hospital-specific initiatives and recommendations to improve our hospital's system while sharing our hospital experience.

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Implications of Fault‐Valve Behavior From Immediate Aftershocks Following the 2023 M_j6.5 Earthquake Beneath the Noto Peninsula, Central Japan

Cited by 43 publications

References 41 publications

A Multiplex Rupture Sequence under Complex Fault Network due to Preceding Earthquake Swarms during the 2024 Mw 7.5 Noto Peninsula, Japan, Earthquake

A Multiplex Rupture Sequence under Complex Fault Network due to Preceding Earthquake Swarms during the 2024 Mw 7.5 Noto Peninsula, Japan, Earthquake

Slip distribution of the 2024 Noto Peninsula earthquake (MJMA 7.6) estimated from tsunami waveforms and GNSS data

Initial response to the 2024 Noto earthquake by the university hospital closest to the disaster area

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