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• W2113766205 abstract "There are 13 papers in this special issue on stress field, crustal deformation and seismicity. The great Wenchuan earthquake is a grievous disaster, but Chinese scientists are trying to learn more from the event in order to understand better the physics of earthquakes for future hazard mitigation planning. Rapid development of GPS technology provide the possibility in the first time in history to monitor the crustal deformation in a wide range and high accuracy, however, it is an important lesson learned from the Wenchuan earthquake, that GPS deformation alone is insufficient for forecast of major earthquakes. The Longmenshan fault zone is of low strain rate and relatively low historical seismicity in comparison with a number of strike slip faults in the western Sichuan region, such as the Xianshuihe fault, Xiaojiang fault, etc. However, the Wenchuan earthquake broke out in Longmenshan fault zone as a surprise to most Chinese seismologists. Guo et al (2009) happened to make hydrofracture stress measurement at the northeastern part of the Longmenshan fault one week before the great Wenchuan earthquake, and was able to make repeated measurement after the earthquake. They found stresses were high close to the fault zone than those from boreholes farther away from the fault zone before the main quake, indicating that stress may accumulate and exceed strength of rock mass even though the strain rate is low. In contrary, high strain rate may not necessarily lead to great earthquakes if stress can be rapidly released from a number of media or strong earthquakes as well as slow or quiet earthquakes. Therefore, this issue of stress field, crustal deformation and seismicity emphasis a new point of view to investigate both strain and stress in relation to earthquake activity. Reliable stress measurement is expected to become a priority in earthquake related network construction. Chi reported deployment of 40 sets YRY-4 four -component borehole strainmeters in China as part of the National “Digital Seismic Observation Network Project”. The new generation instrument has a strain resolution of 5×10 −11 , response frequency range of DC-20Hz, and can record solid tidal strain clearly. The four-component of strainmeter provide a way to cross check reliability of the measurements, since three components are enough to determine the horizontal strain tensor components. The author was trying to show several pre-seismic strain anomalies had been observed before large earthquakes. I hope the raw data can be used to calculate eθ, eφ, eθφ and σθ, σφ, σθφ in the future to help us understand the long term stress tensor variations. There are three papers discussing different aspects" @default.
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• W2113766205 date "2009-12-01" @default.
• W2113766205 modified "2023-09-24" @default.
• W2113766205 title "Stress, strain and earthquake activity" @default.
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• W2113766205 doi "https://doi.org/10.1007/s11589-009-0575-3" @default.
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