![]() ![]() “Stress Triggering” between different rupture events in several earthquakes. Static stress changes and the triggering of earthquakes. Response of the San Andreas fault to the 1983 Coalinga-Nuñez Earthquake: An application of interaction-based probabilities for Parkfield. ![]() Internal deformation due to shear and tensile faults in a half-space. Seismol Geomag Obs Res (in Chinese), 1996, 17: 34–41 The focal mechanisms of small events of the 1976 Songpan earthquake sequence. Acta Seismal Sin (in Chinese), 1982, 4: 136–148ĭiao G L, Cheng W Z, Li G F, et al. StressStrike StrainDip Compression stressJoint Tension stressFault Shear stressDip-slip fault Elastic strainStrike-slip fault Plastic strainOblique-slip fault Ductile strainNormal fault Brittle strainReverse fault AnticlineThrust fault SynclineLeft-lateral MonoclineRight-lateral Stress and Strain: Stress is an applied force. On the direction of the maximum compressive principal stress before and after the 1976 Songpan-Pingwu Earthquake ( M=7.2) of Sichuan Province. Focal mechanism and aftershock locations of the Songpan earthquake of August 1976 in Sichuan China. ![]() The Triggering Mechanism of the Largest Aftershock ( Ms = 6.3) of the 1973 Luhuo Great Earthquake ( Ms = 7.6). Field study of a highly active fault zone: The Xianshuihe fault of southwestern China. Thesis Collection of Seismic Academic Conference about Xianshuihe Rupture Zone (in Chinese). Crust rupture graph and seismic tectonic of the North-west segment of Xianshuihe fault zone. Active faulting and block movement associated with large earthquakes in the Min Shan and Longmen Mountains, northeastern Tibetan Plateau. ![]() Beijing: Seismic Press, 1979Ĭhen S F, Wilson C J L, Deng Q D, et al. General model calculations show that there is a good triggering relationship between adjacent left-lateral slip fault and thrust fault, but triggering between parallel slip faults is rather weak.Įarthquake Administration of Sichuan Province.The 1976 Songpan Earthquake (in Chinese). The third main shock is also a left-lateral event, however, the triggering relationship between the third main shock and the previous two events is less obvious. Therefore, we conclude that the first main shock had triggered the second main shock. We also show that the first main shock ( M s = 7.2), which is a left-lateral slip event, had increased the Coulomb stresses by 5×10 5 Pa at the second main shock (a thrust event with M s = 6.7). The results show that most of the aftershocks had occurred in the region where the Coulomb stresses had been increased, indicating a triggering relationship between the main shocks and the aftershocks. Large uncertainties related to the neotectonic framework of Jamaica remain and more detailed fault characterization studies are necessary to accurately assess seismic hazards.Based on the published focal mechanisms we have built the fault model of the main shocks of the 1976 Songpan earthquake sequence and calculated the coseismic Coulomb stress changes in the region. The long period of quiescence and subdued geomorphic expression of the EPGFZ indicates that it may only accommodate part of the ∼7–9 mm=yr plate deformation rate measured geodetically and that slip may be partitioned on other undocumented faults. The results suggest that the fault has not ruptured the surface in at least 500 yr and possibly as long as 28 ka. Documentation of a river bank exposure and several trenches indicate that this fault is active and has the potential to cause major destructive earthquakes in Jamaica. We present here new geomorphic and paleoseismic information bearing on the location and relative activity of the EPGFZ, which marks the plate boundary in Jamaica. Past large earthquakes that destroyed the capital cities of Kingston, Jamaica (1692, 1907), and Port-au-Prince, Haiti (1751, 1770), as well as the 2010 Haiti earthquake that killed more than 50,000 people, have heightened awareness of seismic hazards in the northern Caribbean. The countries of Jamaica, Haiti, and the Dominican Republic all straddle the Enriquillo–Plantain Garden fault zone ( EPGFZ), a major left-lateral, strike-slip fault system bounding the Caribbean and North American plates. ![]()
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