Fault stress inversion reveals seismogenic asperity of the 2011 Mw 9.0 Tohoku-Oki earthquake

Xie, Zheng; Cai, Yongen; Wang, Chi‐Yuen; Yoshioka, Shoichi; Tanaka, M.

doi:10.1038/s41598-019-47992-x

Cited by 5 publications

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, they can obtain fault normal stress changes, which are absent in the Rapperger and Mai's method but can be significant in dipslip faulting earthquakes such as the Tohoku earthquake. They further applied the method to invert for fault stress accumulations (both shear and normal stresses) directly from GPS data before the Tohoku earthquake, revealing large shear stress accumulations and normal stress variations in the Tohoku coseismic rupture areas (Xie et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Inverting for dynamic stress evolution on earthquake faults directly from seismic recordings

Meng¹,

Duan²,

Liu

et al. 2022

Preprint

View full text Add to dashboard Cite

Dynamic stress evolution during earthquake rupture contains information of fault frictional behavior that governs dynamic rupture propagation. Most of earthquake stress drop and evolution studies are based on kinematic slip inversions. Several dynamic inversion methods in the literature require dynamic rupture modeling that makes them cumbersome with limited applicability. In this study, we develop a fault-stress model of earthquake sources in the framework of the representation theorem. We then propose a dynamic stress inversion method based on the fault-stress model to directly invert for dynamic stress evolution process on the fault plane by fitting seismic data. In this inversion method, we calculate numerical Green's function once only, using an explicit finite element method EQdyna with a unit change of shear or normal stress on each subfault patch. A linear least-squares procedure is used to invert for stress evolution history on the fault. To stabilize the inversion process, we apply several constraints including zero normal slip (no separation or penetration of the fault), non-negative shear slip, and moment constraint. The method performs well and reliably on a synthetic model, a checkerboard model and the 2016 Mw 5.0 Cushing (Oklahoma) earthquake. The proposed fault-stress model of earthquake sources with inversion techniques such as one presented in this study provides a new paradigm for earthquake source studies using seismic data, with a potential of deciphering more physics from seismic recordings of earthquakes.

show abstract

Section: Introductionmentioning

confidence: 99%

Inverting for dynamic stress evolution on earthquake faults directly from seismic recordings

Meng¹,

Duan²,

Liu

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Fault Reactivation in Response to Saltwater Disposal and Hydrocarbon Production for the Venus, TX, Mw 4.0 Earthquake Sequence

Haddad

Eichhubl

2022

Rock Mech Rock Eng

View full text Add to dashboard Cite

A review of shallow slow earthquakes along the Nankai Trough

Takemura,

Hamada,

Okuda

et al. 2023

Earth Planets Space

View full text Add to dashboard Cite

Slow earthquakes occur at deep and shallow plate boundaries along the Nankai Trough. Deep slow earthquakes are continuously distributed along the 30–40 km depth contours of the upper surface of the subducted Philippine Sea Plate. In contrast, shallow slow earthquakes occur in limited regions: Hyuga-nada, off Cape Muroto, and southeast off the Kii Peninsula. This review provides an overview of the up-to-date seismological, geodetic, geological, and experimental results in the shallow Nankai area for a unified understanding of the spot-like occurrence of shallow slow earthquakes. Shallow slow earthquakes tend to be distributed in transitional regions between the frictionally locked and stably sliding zones on the plate boundary. Based on geological and experimental studies, the lithology of incoming sediments and their friction coefficients can be variable along the Nankai Trough. Laboratory friction experiments revealed that sediments under shallow plate boundary conditions often exhibit positive (a − b) values, while negative (a − b) is possible via several processes. Subducted seamounts create complex fracture networks and stress shadows in their surrounding areas; however, not all subducted seamounts are related to shallow slow earthquake activities. This incomplete correlation suggests that alternative factors are required to explain the spot-like distribution of shallow slow earthquakes in the Nankai subduction zone. High pore fluid pressure conditions around shallow slow earthquake zones were interpreted based on seismological structural studies. In addition, ambient noise monitoring revealed temporal changes in seismic velocity structures associated with shallow slow earthquake migrations. This result suggests a close link between pore fluid migration and shallow slow earthquake episodes. Because transient changes in pore fluid pressure can lead to various slip behaviors, the episodic migration of pore fluid around the plate boundary could promote shallow slow earthquake activity along the Nankai Trough. Graphical Abstract

show abstract

Fault stress inversion reveals seismogenic asperity of the 2011 Mw 9.0 Tohoku-Oki earthquake

Cited by 5 publications

References 29 publications

Inverting for dynamic stress evolution on earthquake faults directly from seismic recordings

Inverting for dynamic stress evolution on earthquake faults directly from seismic recordings

Fault Reactivation in Response to Saltwater Disposal and Hydrocarbon Production for the Venus, TX, Mw 4.0 Earthquake Sequence

A review of shallow slow earthquakes along the Nankai Trough

Contact Info

Product

Resources

About