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Zhu Jinfang 《中国地震研究》2005,19(3):224-239
INTRODUCTIONFuzhouis an ancient cultural city,having a history of2200years,being one of the earliestcoastal cities that were open to the outside world.It is a bigalopolis on the southeast coast of Chinawith developed economy and dense population.The urban… 相似文献
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We carried out paleoseismological analyses in Norcia, one of the oldest town of central Italy. Four trenches were dug in late Pleistocene–Holocene deposits, across an unmapped, antithetic splay of the Norcia Fault System. The investigated fault runs through the recent settlement of the town, brushing against the middle-age city walls. We found evidence of repeated surface ruptures in the past 20 ky, the last one dated to a period fitting with the 1703 AD, catastrophic earthquake (M = 6.8). Our data (i) show definitively the late Pleistocene–Holocene activity of the Norcia Fault System, (ii) strengthen the historical accounts describing surface ruptures during the 1703 event in Norcia, (iii) cast light on the seismogenic behavior of the 70-km-long fault system between L'Aquila and Norcia (central Italy) and (iv) predict the occurrence of normal surface faulting inside the municipality of Norcia during future M ≥ 6 earthquakes. 相似文献
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Seismic activity at the western Pyrenean edge 总被引:1,自引:1,他引:1
M. Ruiz J. Gallart J. Díaz C. Olivera D. Pedreira C. Lpez J.M. Gonzlez-Cortina J.A. Pulgar 《Tectonophysics》2006,412(3-4):217-235
The present-day seismicity at the westernmost part of the Pyrenean domain reported from permanent networks is of low to moderate magnitude. However, it is poorly constrained due to the scarce station coverage of the area. We present new seismic data collected from a temporary network deployed there for 17 months that provides an enhanced image of the seismic activity and its tectonic implications. Our results delineate the westward continuity of the E–W Pyrenean band of seismicity, through the Variscan Basque Massifs along the Leiza Fault, ending up at the Hendaya Fault. This seismicity belt is distributed on a crustal scale, dipping northward to almost 30 km depth. Other relevant seismic events located in the area can be related to the central segment of the Pamplona fault, and to different E–W thrust structures. 相似文献
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Heiko?WoithEmail author Rongjiang?Wang Claus?Milkereit Jochen?Zschau Ulrike?Maiwald Asaf?Pekdeger 《Hydrogeology Journal》2003,11(1):113-121
At four sites in Turkey and Armenia the physico-chemical properties of thermal and mineral waters were monitored continuously
during the Izmit and Düzce earthquakes that occurred along the North Anatolian fault in August and November 1999. The epicentral
distances between the moment magnitude (Mw) 7.6 Izmit earthquake and the monitoring locations were 313, 488, 1,161, and 1,395 km. At the most distant site, the specific
electrical conductivity of mineral water from a flowing artesian well dropped co-seismically and postseismically by 7%. No
changes were observed at the other sites, although the estimated earthquake strains and peak ground accelerations are much
higher. A similar pattern was observed after the Düzce earthquake, which happened three months after the Izmit event. The
response of a hydrogeological system seems to depend on the site characteristics rather than on the nature of the earthquake.
A hydrogeological model for the sensitive observation site farthest from the Izmit earthquake explains the observations in
terms of a changed mixing ratio between two fluid components. Passing seismic waves may trigger a local pore-pressure increase
according to the mechanism of advective overpressure. The preconditions for this mechanism, free gas bubbles in the aquifer
in combination with a trap for rising bubbles, is probably not fulfilled by the other groundwater systems.
Electronic Publication 相似文献
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The Seismicity and Seismological Work of Myanmar 总被引:1,自引:0,他引:1
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本文对目前地壳垂直形变的数据采集、使用、信息提取及解释的现状等进行了分析,指出了存在的一些缺陷或不足,同时也提出了一些有关的看法。如果这些问题得不到较好的解决,则必然会导致形变分析的混乱,以致于影响形变研究的深入。 相似文献
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广西北流地区的地震构造与地震活动 总被引:1,自引:0,他引:1
根据地质调查资料,研究了广西北流地区的地震构造及其中与中小地震的关系,结果表明,北流地区的构造格架属于右行右阶拉分区型,在容县-玉林-带形成拉分区,区内及附的 在多组断裂,构造复杂,易于积聚应变能,是中小地震的多发区。 相似文献