[1] Spaceborne gravimetry data from the Gravity Recovery And Climate Experiment (GRACE) are processed using spatio-spectral Slepian localization analysis enabling the high-resolution detection of permanent gravity change associated with both coseismic and postseismic deformation resulting from the great 11 March 2011 Mw 9.0 TohokuOki earthquake. The GRACE observations are then used in a geophys...

We describe and test a procedure to accurately co-register and correlate multi-temporal aerial images. We show that this procedure can be used to measure surface deformation, and explore the performance and limitations of the technique. The algorithms were implemented in a software package, COSI-Corr (available from the Caltech Tectonics Observatory website). The technique is validated on sever...

The island of Cephalonia, Western Greece, was struck by two strong seismic events, with magnitudes, ML= 5.8 and ML = 5.7 which occurred on Jan. 26, 2014 and Feb. 3, 2014 respectively. The first event was located near Argostoli’s town, whereas the second one was located at the north part of Livadi village. These two strong earthquake events followed by smaller aftershocks provoking extensive cru...

The 2011 Tohoku-oki earthquake was the largest earthquake ever observed with seafloor geodetic techniques in and around its source region. Large crustal deformation associated with both the coseismic rupture and the rapid postseismic deformation has been reported. However, these observations are insufficient to describe the postseismic deformation processes occurring around the broad rupture ar...

The main objective of this research project is to residual deformation and collapse mechanism of structural system and to assess the seismic demand of this system. In this study three major works are developed: a. Develop a physical-based inelastic hysteretic model which contains stiffness and strength degradation, pinching and residual deformation, b. Based on the proposed model the seismic de...

[1] We examine the work energy budget of actively deforming fault systems in order to develop a means of examining the systemic behavior of complex fault networks. Work done in the deformation of a faulted area consists of five components: (1) work done against gravity in uplift of topography (Wgrav); (2) internal energy of the strained host rock (Wint); (3) work done resisting friction during ...

High spatial resolution measurements of interseismic deformation along major faults are critical for understanding the earthquake cycle and for assessing earthquake hazard. We propose a new remove/filter/restore technique to optimally combine GPS and InSAR data to measure interseismic crustal deformation, considering the spacing of GPS stations in California and the characteristics of interseis...

Seismic anisotropy is sensitive to the alignment of minerals, fluid-filled cracks, and fractures caused by fault deformation, thus providing a signature especially in aseismic layer. In this study, we use seismic traveltime tomography study spatial distribution azimuthal region 2013 Mw 6.6 Lushan earthquake. Our analysis reveals both stress-induced structure-controlled mechanisms. The seismicit...

The 14 November 2000, Ms8.1 Kokoxili earthquake is of huge influence in the world, which ruptured more than 400 km of the western end of the left-lateral Kunlun fault. The Kunlun fault is active and also after the heavy earthquake, it will definitely undergo an adjusting and balancing process. SAR Intereferometry (INSAR) is an effective measure for crustal deformation measurement even for minor...

Earthquakes deep in the continental lithosphere are rare and hard to interpret in our current understanding of temperature control on brittle failure. The recent lithospheric mantle earthquake with a moment magnitude of 4.8 at a depth of ~75 km in the Wyoming Craton was exceptionally well recorded and thus enabled us to probe the cause of these unusual earthquakes. On the basis of complete eart...