— The Internet is a complex system, whose temporal behavior is highly nonstationary and exhibits sudden drastic changes regarded as main shocks or catastrophes. Here, analyzing a set of time series data of round-trip time measured in echo experiment with the Ping Command, the property of “aftershocks” (i.e., catastrophes of smaller scales) after a main shock is studied. It is found that the aft...

Broadband, large dynamic range GEOS data from four aftershocks (M L 2 to 3) of the 1983 Goodnow, New York, earthquake, recorded at hard-rock sites 2 to 7 km away from the epicentral area, are used to study rupture processes of three larger events, with an M L = 1.6 event as the Green's function event. We analyze the spectra and spectral ratios of ground velocity at frequencies up to 100 Hz, and...

In the last few years, several mainshock–aftershock sequences have demonstrated their effects on structures; especially after occurrence of an earthquake with high magnitude, number aftershocks tends to increase. For this reason, studies been oriented estimate influence structural response, most them in terms peak or residual displacement; however, energy plays important role for long-duration ...

After a strong mainshock, subsequent ground motion is the result of sequence multiple aftershocks, and damage to structure under these conditions more severe than from single earthquake. Most seismic studies are based on earthquake event. To explore influence main-aftershock an isolated inter-story structure, we constructed three-dimensional finite-element model such subjected it repeated seque...

Forecasting the aftershock probability has been performed by the authorities to mitigate hazards in the disaster area after a main shock. However, despite the fact that most of large aftershocks occur within a day from the main shock, the operational forecasting has been very difficult during this time-period due to incomplete recording of early aftershocks. Here we propose a real-time method f...

Due to low stiffness of braces after yielding, the structures with buckling-restrained braces (BRBs) experience high residual drifts during an earthquake, which can be intensified by aftershocks and causes considerable damages to structures. Also, due to poor distribution of stiffness, this problem is exacerbated for irregular structures. Recently, the yielding brace system (YBS) has been intro...