A large number of probabilistic earthquake occurrence models are currently available for seismic hazard assessment. This paper reviews the basic assumptions of the various models, summarizes their stochastic representations and discusses the parameters needed for applications. While the Poisson model is one of the most commonly used in practice it is limited in its representation of the physica...

We investigate global variations in the pattern of aftershock area expansion associated with large subduction zone earthquakes. The expansion of aftershock areas with time is relatively small in the subduction zones of Alaska, the Aleutians, Mexico, and parts of the Kuriles and South America. These subduction zones are interpreted to be characterized by moderate to strong interplate coupling. I...

This paper presents a numerical investigation on seismic performance of reinforced concrete (RC) cantilever columns under unidirectional and bidirectional excitations. The influence cross-sectional geometry multiple excitations have been examined in this study. An advanced nonlinear finite element model is employed to different failure modes RC excitation. simulates degradation materials cyclic...

Abstract We investigated seismic velocity changes ( dv / v ) associated with the 2019 Ridgecrest earthquake sequence high‐frequency autocorrelations of ambient noise data. Daily autocorrelation functions were computed for entirety and first quarter 2020 broadband stations within region, including temporary installed during aftershock deployment. Travel time shifts in daily functions, relative t...

Repeated earthquakes and explosions recorded at the San Andreas fault (SAF) near Parkfield before and after the 2004 M6 Parkfield earthquake show large seismic velocity variations within an approximately 200m-wide zone along the fault to depths of approximately 6 km. The seismic arrays were co-sited in the two experiments and located in the middle of a high-slip part of the surface rupture. Wav...

Induced seismicity has become a concern for industry and nearby residents. Fluid-induced earthquakes are side effect of industrial operations such as hydraulic fracturing, where high-pressure fluids pumped into the Earth’s crust to increase hydrocarbon flow well from petroleum-bearing rock formations. Previous studies on fluid-induced showed existence spatiotemporal clustering aftershock activi...

Abstract We calculated apparent stresses for 70 earthquakes ( M W ? 5.0) occurring in the aftershock region of 2010 8.8 Bio-Bío earthquake from January 1990 to September 2019. identified that average stress was approximately 0.487 MPa between and December 2005 1.063 within period 2006 2010. The latter one is 2.2-fold greater than former, representing a significant difference as determined by z ...

Abstract When a notable earthquake occurs in the United States, range of familiar real- and near-real-time products are produced by U.S. Geological Survey (USGS) Advanced National Seismic System (ANSS), made available via ANSS Comprehensive Earthquake Catalog. For historical early instrumental earthquakes, similar results developed depending on data availability event significance, drawing from...

Crustal deformation due to the 2016 earthquake sequence in Kumamoto, Japan, that culminated a preceding of magnitude M6.5 and subsequent M7.3 28 hours later, caused stress perturbation on around causative Futagawa-Hinagu fault zone. Monitoring changes seismicity pattern along this zone plays role understanding process before after major earthquakes. For purpose, stress-dependent laws statistica...