Complex tsunamigenic near-trench seafloor deformation during the 2011 Tohoku-Oki earthquake

被引：2
|
作者：
Zhang, Kai [1 ,2 ,3 ]
Wang, Yanru [1 ]
Luo, Yu [1 ]
Zhao, Dineng [2 ,3 ]
Wang, Mingwei [2 ]
Yang, Fanlin [1 ,3 ]
Wu, Ziyin [2 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Geodesy & Geomat, Qingdao, Peoples R China
[2] Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou, Peoples R China
[3] Minist Nat Resources, Key Lab Ocean Geomat, Qingdao, Peoples R China
来源：
NATURE COMMUNICATIONS | 2023年 / 14卷 / 01期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
PLATE-BOUNDARY; SLIP; DISPLACEMENT; GENERATION; MEGATHRUST; RUPTURE; ZONE;
D O I：
10.1038/s41467-023-38970-z
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The near-trench coseismic rupture behaviour of the 2011 Tohoku-Oki earthquake remains poorly understood due to the scarcity of near-field observations. Differential bathymetry offers a unique approach to studying offshore coseismic seafloor deformation but has a limited horizontal resolution. Here we use differential bathymetry estimates with improved horizontal resolutions to investigate near-trench coseismic slip behaviours in the 2011 Tohoku-Oki earthquake. In the main rupture region, a velocity-strengthening behaviour in the shallow fault is observed. By contrast, the seafloor uplift decreases towards the trench, but the trend inverts near the backstop interface outcrop, revealing significant off-fault deformation features. Amongst various competing off-fault effects observed, we suggest that inelastic deformation plays a predominant role in near-trench tsunami excitation. Large trench-bleaching rupture is also observed immediately north of 39 degrees, delimiting the northern extent of the main rupture region. Overall, striking spatial heterogeneity of the shallow rupture behaviour is revealed for the region.
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页数：10
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