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Precise Three-Dimensional Deformation Retrieval in Large and Complex Deformation Areas via Integration of Offset-Based Unwrapping and Improved Multiple-Aperture SAR Interferometry:Application to the 2016 kumamoto earthquake

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Engineering 2020年第8期6卷 927-935页

作者： Won-Kyung Baek Hyung-Sup Jung Department of Geoinformatics University of SeoulSeoul 02504Republic of Korea

Conventional synthetic aperture radar(SAR)interferometry(InSAR)has been successfully used to precisely measure surface deformation in the line-of-sight(LOS)direction,while multiple-aperture SAR interferometry(MAI)has provided precise surface deformation in the along-track(AT)*** of the InSAR and MAI methods enables precise measurement of the two-dimensional(2D)deformation from an interferometric pair;recently,the integration of ascending and descending pairs has allowed the observation of precise three-dimensional(3D)*** 3D deformation measurement has been applied to better understand geological events such as earthquakes and volcanic *** surface deformation related to the 2016 kumamoto earthquake was large and complex near the fault line;hence,precise 3D deformation retrieval had not yet been *** objectives of this study were to①perform a feasibility test of precise 3D deformation retrieval in large and complex deformation areas through the integration of offset-based unwrapped and improved multiple-aperture SAR interferograms and②observe the 3D deformation field related to the 2016 kumamoto earthquake,even near the fault *** ascending pairs and one descending the Advanced Land Observing Satellite-2(ALOS-2)Phased Array-type L-band Synthetic Aperture Radar-2(PALSAR-2)pair were used for the 3D deformation *** in situ Global Positioning System(GPS)measurements were used to validate the 3D deformation measurement *** achieved accuracy was approximately 2.96,3.75,and 2.86 cm in the east,north,and up directions,*** results show the feasibility of precise 3D deformation measured through the integration of the improved methods,even in a case of large and complex deformation.

关键词： Synthetic aperture radar(SAR) Conventional SAR interferometry(InSAR) Multiple-aperture SAR interferometry(MAI) ALOS-2 PALSAR-2 3D deformation retrieval 2016 kumamoto earthquake

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Focal mechanics and disaster characteristics of the 2024 M 7.6 Noto Peninsula earthquake, Japan

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FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING 2024年第9期18卷 1378-1387页

作者： Chen, Guang-qi Wu, Yan-qiang Xia, Ming-yao Li, Zhi-yuan Hebei Univ Technol Sch Civil & Transportat Engn Tianjin 300131 Peoples R China Kyushu Univ Grad Sch Engn Fukuoka 8190395 Japan China earthquake Adm Monitoring & Applicat Ctr 1 Tianjin 300180 Peoples R China Chengdu Univ Technol State Key Lab Geohazard Prevent & Geoenvironm Prot Chengdu 610059 Peoples R China

On January 1, 2024, a devastating M 7.6 earthquake struck the Noto Peninsula, Ishikawa Prefecture, Japan, resulting in significant casualties and property damage. Utilizing information from the first six days after the earthquake, this article analyzes the seismic source characteristics, disaster situation, and emergency response of this earthquake. The results show: 1) The earthquake rupture was of the thrust type, with aftershock distribution showing a north-east-oriented belt-like feature of 150 km. 2) Global Navigation Satellite System (GNSS) and Interferometric synthetic aperture radar (InSAR), observations detected significant westward to north-westward co-seismic displacement near the epicenter, with the maximum horizontal displacement reaching 1.2 m and the vertical uplift displacement reaching 4 m. A two-segment fault inversion model fits the observational data well. 3) Near the epicenter, large Peak Ground Velocity (PGV) and Peak Ground Acceleration (PGA) were observed, with the maxima reaching 145 cm/s and 2681 gal, respectively, and the intensity reached the highest level 7 on the Japanese (Japan Meteorological Agency, JMA) intensity standard, which is higher than level 10 of the United States Geological Survey (USGS) Modified Mercalli Intensity (MMI) standard. 4) The observation of the very rare multiple strong pulse-like ground motion (PLGM) waveform poses a topic worthy of research in the field of earthquake engineering. 5) As of January 7, the earthquake had left 128 deaths and 560 injuries in Ishikawa Prefecture, with 1305 buildings completely or partially destroyed, and had triggered a chain of disasters including tsunamis, fires, slope failures, and road damage. Finally, this paper summarizes the emergency rescue, information dissemination, and other disaster response and management measures taken in response to this earthquake. This work provides a reference case for carrying out effective responses, and offers lessons for handling similar events

关键词： Noto Peninsula earthquake earthquake rupture mechanism earthquake disaster emergency response pulse-like ground motion 2016 kumamoto earthquake WENCHUAN earthquake

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