-The Cocos plate subducts beneath North America at the Mexico trench. The northernmost segment of this trench, between the Orozco and Rivera fracture zones, has ruptured in a sequence of five large earthquakes from 1973 to 1985: the Jan. 30, 1973 Colima event (M, 7.5) at the northern end of the segment near Rivera fracture zone; the Mar. 14, 1979 Petatlan event (M s 7.6) at the southern end of ...

We conduct a detailed analysis of the seismic records for 406 marine earthquakes in SW offshore of Taiwan recorded by a small OBS array during 7 12 October 2005. The spatial distribution of the events, which included a complete main shock-aftershock sequence, show concentration in a vertical chain reaching 40 km in depth and that the deeper events slightly turns to the NE toward the Taiwan isla...

[1] New seismic and geodetic data from Costa Rica provide insight into seismogenic zone processes in Central America, where the Cocos and Caribbean plates converge. Seismic data are from combined land and ocean bottom deployments in the Nicoya peninsula in northern Costa Rica and near the Osa peninsula in southern Costa Rica. In Nicoya, inversion of GPS data suggests two locked patches centered...

Kosovo is one of the most seismically active regions in Europe, lying within Alpine-Mediterranean tectonic belt. Historical records for region show several catastrophic earthquakes with epicentral intensity IX (MCS). However, due to Kosovo’s high population density, prevalence traditional construction, and insufficient enforcement building codes, vulnerable earthquake damage. In this study, we ...

Stich, D., Mancilla, F., Morales, J., Crust-mantle coupling in the Gulf of Cadiz (SW Iberia), Geophys . Res . Le t t . , 32 , L13306, doi:10.1029/2005GL023098. 2005 Terrinha, P., Pinheiro, L.M., Henriet, J.P., Matias, L., Ivanov, M.K., Monteiro, J.H., Akhmetzhanov, A., Volkonskaya, A., Cunha, T., Shaskin, P., Rovere, M, Tsunamigenic-seismogenic structures, neotectonics, sedimentary processes an...

A risk assessment of vegetation zone responses to climate change was conducted using the classical Holdridge life zone model on the Loess Plateau of Northwest China. The results show that there are currently ten vegetation zones occurring on the Loess Plateau (1950–2000), including alvar desert, alpine wet tundra, alpine rain tundra, boreal moist forest, boreal wet forest, cool temperate desert...

ULF (ultra-low-frequency) electromagnetic emission is recently recognized as one of the most promising candidates for short-term earthquake prediction. This paper reviews previous convincing evidence on the presence of ULF emissions before a few large earthquakes. Then, we present our network of ULF monitoring in the Tokyo area by describing our ULF magnetic sensors and we finally present a few...

The initial stages of fault development have been recognized in laboratory experiments, but not at seismogenic depths. To fully understand how faults initially develop and begin to evolve, one needs to first recognize and then observe the emerging structure. Recognizing the birth of a fault requires a priori knowledge of the regional tectonics, geologic structure, and seismic history. This info...

We have discovered nonvolcanic tremor activity (i.e., long-duration seismic signals with no clear P or S waves) within a transform plate boundary zone along the San Andreas Fault near Cholame, California, the inferred epicentral region of the 1857 Fort Tejon earthquake (moment magnitude approximately 7.8). The tremors occur between 20 to 40 kilometers' depth, below the seismogenic zone (the upp...