9 Two critical items in the energetic budget of a seismic province are the strain rate, which 10 is measured geodetically on the Earth’s surface, and the yearly number of earthquakes 11 exceeding a given magnitude. Our study is based on one of the most complete and recent 12 seismic catalogues of Italian earthquakes and on the strain rate map implied by a multi13 year velocity solution for perm...

We present estimates of future earthquake rate density (probability per unit area, time, and magnitude) on a 0.1degree grid for a region including California and Nevada, based only on data from past earthquakes. Our long-term forecast is not explicitly time-dependent, but it can be updated at any time to incorporate information from recent earthquakes. The present version, founded on several de...

Broadband (0.1–20 Hz) synthetic seismograms for finite-fault sources were produced for a model where stress drop is constant with seismic moment to see if they can match the magnitude dependence and distance decay of response spectral amplitudes found in the Next Generation Attenuation (NGA) relations recently developed from strong-motion data of crustal earthquakes in tectonically active regio...

15 In order to reproduce slow earthquakes with short duration such as very low 16 frequency events (VLFs) migrating along the trench direction as swarms, we apply a 17 3-D subduction plate boundary model based on the slowness law of rate-and 18 2 state-dependent friction, introducing close-set numerous small asperities 1 (rate-weakening regions) at a depth of 30 km under high pore pressure cond...

We analyzed the historical seismicity in southern California to develop a rational approach for calculating the seismic hazard from background seismicity of magnitude 6.5 or smaller. The basic assumption for the approach is that future earthquakes will be clustered spatially near locations of historical mainshocks of magnitudes equal to or greater than 4. We analyzed the declustered California ...

The spatial distribution of seismicity is often used as one of the indicators of zones where future large earthquakes are likely to occur. This is particularly true for intraplate regions such as the central and eastern United States, where geology is markedly enigmatic for delineating seismically active areas. Although using past seismicity for this purpose may be intuitively appealing, it is ...

A downhole seismometer at 900-m depth and a temporary network of surface stations were deployed to use rays from local microearthquakes to study the upper and middle crust beneath the Long Valley caldera. The downhole seismograms show S waves with high apparent amplitudes from earthquakes located 2-20 km to the south of the downhole seismometer. In contrast, S waves from earthquakes located in ...

an important aim of seismology is to determine focuses of earthquakes. the more precisely the process is carried out, the better results will be achieved in various studies, for example, in vestigation of the crustal structure and seismogenic zone or the determination of the plane of faults causing earthquakes. the classic methods of locating are based on geiger's equations (1910). the rel...

[1] We present a new crustal seismic velocity model for southern California derived from P and S arrival times from local earthquakes and explosions. To reduce the volume of data and ensure a more uniform source distribution, we compute ‘‘composite event’’ picks for 2597 distributed master events that include pick information for other events within spheres of 2 km radius. The approach reduces ...