This study investigates the effects of earthquake types, magnitudes, and hysteretic behavior on the peak and residual ductility demands of inelastic single-degree-of-freedom systems and evaluates the effects of major aftershocks on the non-linear structural responses. An extensive dataset of real mainshock–aftershock sequences for Japanese earthquakes is developed. The constructed dataset is la...

[1] The 27 February 2010 Maule, Chile (Mw=8.8) earthquake is one of the best instrumentally observed subduction zone megathrust events. Here we present locations, magnitudes and cumulative equivalent moment of the first 2 months of aftershocks, recorded on a temporary network deployed within 2 weeks of the occurrence of the mainshock. Using automatically-determined onset times and a back projec...

The 28 June 1992 Big Bear earthquake occurred at 15:05:21 GMT and is considered to be an af tershock of the earlier Mw = 7.3 Landers earthquake. F rom overall aftershock locations and long-period focal studies, rupture is general ly assumed to have propagated northeast. No surface rupture was found, however , and the mainshock locations determined f rom both strong motion and TERRAscope data ar...

On average, soil sites behaved nonlinearly during the M 6.7 1994 Northridge, California, earthquake. This conclusion follows from an analysis that combines elements of two independent lines of investigation. First, we apply the stochastic finite-fault simulation method, calibrated with 28 rock-site recordings of the Northridge mainshock, to the simulation of the input motions to the soil sites ...

Aftershock fragility is usually calculated conditioned on a range of potential post-mainshock damage states. The can be identified using indices, the latter being frequently associated with displacement-based parameters such as maximum drift ratio or residual displacement. However, when reliable simulation structural system in specific state objective numerical study, indicators may not assure ...

Long-period strong motions (> 0.9 second) are simulated in the Kobe area for the mainshock (1/17/95) and the aftershock (2/2/95) of the Hyogoken-Nanbu (Kobe) earthquake. In order to model ground motions in the realistic and highly heterogeneous basin structure, an unstructured 3D FEM (Finite Element Method) is used, which runs efficiently on parallel computers. The simulation results show stron...

Estimates of the tectonic stress state including loading rate and magnitude of background stress are derived from the spatial and temporal distribution of Loma Prieta aftershocks. This technique was previously applied to the Landers aftershock sequence Gross and Kisslinger, 1997] and is based upon the seismicity model of Dieterich 1994]. Dieterich's theory suggests that background seismicity sh...

A mainshock is usually accompanied by a group of ground motions. In many design codes, the effects seismic sequences have been neglected or underestimated. Aftershocks can increase structural damage even cause failure. The current study evaluated behavior rehabilitated and as-built reinforced concrete (RC) structure under real scaled mainshock-aftershocks using nonlinear analysis. Verification ...

The slope instability brought on by earthquakes frequently results in significant property damage and casualties. At present, the research displacement response of a under earthquake has mainly emphasized action mainshock, without accounting for impact an aftershock, spatial variability material parameters is often neglected. fully accounted this paper, dynamic reliability permanent (DP) produc...