We have compared aftershock patterns following several moderate to large earthquakes with the corresponding distributions of coseismic slip obtained from previous analyses of the recorded strong ground motion and teleseismic waveforms. Well-located aftershock hypocenters are projected onto the main shock fault plane, and their positions are examined relative to the zones of coseismic displaceme...

The spatiotemporal stress states in the aftershock region of 2005 West Off Fukuoka Prefecture Earthquake are examined via an analysis b values and focal mechanism solutions. aftershocks aligned roughly NW–SE, with southeastern part believed to correspond Kego Fault, which extends beneath metropolitan area. This study reveals depth-dependent region, where (b = 0.7–1.4) generally higher above mai...

Source characteristics of the Sept. 19, 1985 Michoacan, Mexico earthquake and its aftershock on Sept. 21 were inferred from broadband and short-period teleseismic GDSN records. We Fourier-transformed the P waves, corrected for instrument response, attenuation, geometrical spreading, and radiation pattern (including the depth phases), and then averaged to obtain the teleseismic source spectrum f...

We modeled the source rupture process of the 20 September 1999 ChiChi, Taiwan, earthquake (Mw 7.6) using an integrated dataset of near-field strong ground motion and Global Positioning System observations. This large inland thrust earthquake produced a surface break more than 80 km long along the Chelungpu fault. The event triggered over 700 strong-motion instruments on the island of Taiwan. Th...

[1] Using two continuum models of rate-and-state faults, one with a weaker patch and the other with rheological transition from steady state velocity-weakening to velocity-strengthening friction, we simulate several scenarios of spontaneous earthquake nucleation plausible for natural faults, investigate their response to static shear stress steps, and infer the corresponding aftershock rates. O...

Fault barriers are key structures for studying seismic hazard in regions of intense brittle deformation. The interaction between fault sets affects their seismogenic behavior, if some them act as barriers. Granada Basin, the Betic Cordillera, is a region affected by shallow deformation, it was scenario recent 2021 sequence. This seismicity presented swarm behavior at beginning sequence, followe...

Repeating earthquakes repeatedly rupture the same seismic asperity and are strongly linked to aseismic slip. Here, we study repeating aftershocks of April 16, 2016 MW 7.8 Pedernales earthquake in Ecuador, which generated a large amount afterslip. Using temporary permanent stations, correlate waveforms from one-year catalog aftershocks. We sort events with minimum correlation coefficient 0.95 in...

Beginning in April 2016, a series of shallow, moderate to large earthquakes with associated strong aftershocks struck the Kumamoto area of Kyushu, SW Japan. An Mj 7.3 mainshock occurred on 16 April 2016, close to the epicenter of an Mj 6.5 foreshock that occurred about 28 hours earlier. The intense seismicity released the accumulated elastic energy by right-lateral strike slip, mainly along two...

The occurrence of the September 28, 2004 Mw=6.0 mainshock at Parkfield, California, has significantly increased the mean and aperiodicity of the series of time intervals between mainshocks in this segment of the San Andreas fault. We use five different statistical distributions as renewal models to fit this new series and to estimate the time-dependent probability of the next Parkfield mainshoc...

During November 1988 to April 1989, a seismic swarm of about 400 earthquakes of magnitude between 0.4 and 4.0 occurred near the village of Agron, Andalusia, southern Spain. The pattern of the energy release versus time clearly shows that the dataset is representative of a seismic swarm, where it is not observable a typical mainshock–aftershock sequence. Basing on the Gutenberg–Richter relations...