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本文通过分析南投、台中地震的波形记录及各定位参数 ,总结出该地区的震相特征和各台的震级情况 ,结合地震速报的规程 ,提出了对这两个地区地震速报的建议。 相似文献
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本文重点介绍由福建省数字遥测地震台网自编的地震速报操作平台软件中的七个子程序及其主程序对提高地震速报速度的作用 ,同时也详细阐述实现该软件的几项关键性技术。 相似文献
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本文根据我国地震监测台网的发展趋势,提出了区域数字地震台网实时速报系统的发展目标,着重研究了实现这一目标应解决的实时数据流接收、震相自动识别、震相可靠性处理、实时地震定位、震相到时等值线实时绘制、地震震级的实时计算、地震动强度分布图的实时绘制等问题。我们编制了一套实时地震速报软件,实现了上述功能,并用福建数字地震台网记录的2000至2004年网内ML≥2.5共69个地震事件进行软件功能检测,结果表明网内地震三要素的速报能力,由目前的8分钟左右缩短至30至50秒;与月报目录相比,99%的地震震级误差小于0.2级,1%的地震震级误差在0.3至0.4级;97%的震中误差小于5公里,3%的误差在5至10公里,完全满足地震速报的要求。此外,通过实时仿真技术,系统还可给出实际观测到的PGA、PGV、PGD等值线图,这可为应急救灾确定重灾区和有感范围提供帮助。 相似文献
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对2005年3月6日台湾宜兰海域6.1级有感地震的速报情况进行总结,并对其地震特征进行了初步分析。 相似文献
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本文对 1 999年 1月至 2 0 0 0年 1 2月福建数字地震台网测定的台湾地区ML≥ 5 .0级地震 (9.2 1地震序列取ML≥ 5 .5级地震 )测定了Ms震级 ,并将福建台网测定的ML、Ms震级与中国地震局分析预报中心测定的大震速报Ms震级进行了比较。 相似文献
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本文指出了福建微震仪地震台网在地震速报和编目工作中存在的主要问题以及问题产生的可能原因;着重阐述了闽台两地区速度模型差异大是造成福建地震台网定位台湾地区震中误差的主原因;最后提出减少震中定位误差的改进办法。 相似文献
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闽台地震速报技术研究 总被引：1，自引：0，他引：1
本文通过系统地分析台网正式运行以来记录到主要的网内、网缘、网外地震的各种震相特征和定位参数 ,总结研究各区的震相特征、台站记录状况和震级的误差 ,力争提高台网地震速报的速度和精度。 相似文献
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76 3长周期地震仪 1 997年起取代基式仪 ,承担我国一类合网对国内外地震的监测和对外观测资料交换任务。本文介绍了我台 76 3长周期地震仪的震相记录特征 ,有利于台站对震相的分析 ,提高对外资料交换和大震速报水平。 相似文献
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Kenai, located on the west coast of the Kenai Peninsula, Alaska, subsided during the great earthquake of AD 1964. Regional land subsidence is recorded within the estuarine stratigraphy as peat overlain by tidal silt and clay. Reconstructions using quantitative diatom transfer functions estimate co‐seismic subsidence (relative sea‐level rise) between 0.28±0.28 m and 0.70±0.28 m followed by rapid post‐seismic recovery. Stratigraphy records an earlier co‐seismic event as a second peat‐silt couplet, dated to ～1500–1400 cal. yr BP with 1.14±0.28 m subsidence. Two decimetre‐scale relative sea‐level rises are more likely the result of glacio‐isostatic responses to late Holocene and Little Ice Age glacier expansions rather than to co‐seismic subsidence during great earthquakes. Comparison with other sites around Cook Inlet, at Girdwood and Ocean View, helps in constructing regional patterns of land‐level change associated with three great earthquakes, AD 1964, ～950–850 cal. yr BP and ～1500–1400 cal. yr BP. Each earthquake has a different spatial pattern of co‐seismic subsidence which indicates that assessment of seismic hazard in southern Alaska requires an understanding of multiple great earthquakes, not only the most recent. All three earthquakes show a pre‐seismic phase of gradual land subsidence that marked the end of relative land uplift caused by inter‐seismic strain accumulation. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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《International Geology Review》2012,54(8):712-719
Reports of volcanic eruptions and earthquakes originating from volcanoes indicate that seismic activity preceding the eruption is related not only to eruption magnitude and structure of the volcano, but also to viscosity of the lava at the time of eruption. This follows, since lava of higher viscosity meets greater resistance as it ascends from the magma chamber to the earth's surface and, consequently, greater stress will be produced within and beneath the volcano. The writer gives a condensed statistical breakdown of earthquakes and explosive eruptions of Asama Volcano. The Asama earthquakes treated in the report are mainly those of rather low magnitude (T = 1. 0 sec, V = 350) at the Asama Volcano Observatory, situated 4. 2 km east of the center of the summit crater. This investigation showed that most of the explosive eruptions were preceded by an increase in micro-earthquakes. In addition, an experimental formula for predicting volcanic eruptions, based on the statistical relation between frequency of earthquakes originating from Asama and its explosive eruptions. The forthcoming report (Part II) will discuss the same problem based on seismic observations by more sensitive instruments set nearer the summit crater. — A. Eustus 相似文献
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Induced earthquakes in the Izu peninsula by the Izu-Hanto-Oki earthquake of 1974, Japan 总被引：1，自引：0，他引：1
Ken'ichiro Yamashina 《Tectonophysics》1978,51(3-4)
Recently small earthquakes in the Izu Peninsula, central Japan, occurred in a region where differential strain, or shear strain on the nodal planes, may have been enhanced by the Izu-Hanto-oki earthquake of 1974 (M = 6.9 after JMA). It is suggested that the seismic ctivity was induced by the redistribution of strain accompanying the Izu-Hanto-oki earthquake. The activity from August, 1975, may have also been affected by an abnormal uplift in the northeastern part of the peninsula. Based on plausible models, the uplift caused the accumulation of differential strain in the focal region of the subsequent earthquakes. Quantitatively, this change of crustal strain was of the order of 10−6; it is ten times as much as the average annual accumulation. Consequently, the sudden or rapid change of strain was likely to have played an essential role in the subsequent seismic activity. This effect could be one of the factors which trigger a shallow intra-plate earthquake. 相似文献
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Reassessing the earthquake hazard in Kerala based on the historical and current seismicity 总被引：2，自引：0，他引：2
C.P. Rajendran Biju John K. Sreekumari Kusala Rajendran 《Journal of the Geological Society of India》2009,73(6):785-802
Given the lack of proper constraints in understanding earthquake mechanisms in the cratonic interiors and the general absence
of good quality database, here we reassess the seismic hazard in the province of Kerala, a part of the •stable continental
interior•, based on an improved historical and instrumental database. The temporal pattern of the current seismicity suggests
that >60% of the microtremors in Kerala occurs with a time lag after the peak rainfall, indicating that hydroseismicity may
be a plausible model to explain the low-level seismicity in this region. Further, an increment in overall seismicity rate
in the region in the recent years is explained as due to increased anthropogenic activities, which includes changes in hydrological
pathways as a consequence of rapid landscape changes. Our analyses of the historical database eliminate a few events that
are ascribed to this region; this exercise has also led to identification of a few events, not previously noted. The improved
historical database essentially suggests that the central midland region is more prone to seismic activity compared to other
parts of Kerala. This region appears to have generated larger number of significant earthquakes; the most prominent being
the multiple events (doublets) of 1856 and 1953, whose magnitudes are comparable to that of the 2000/2001 (central Kerala)
events. Occurrences of these historical events and the recent earthquakes, and the local geology indicative of pervasive faulting
as shown by widely distributed pseudotachylite veins suggest that the NNW-SSE trending faults in central midland Kerala may
host discrete potentially active sources that may be capable of generating light to moderate size earthquakes. The frequency
of earthquakes in central Kerala evident from the historical database requires that the seismic codes stipulated for this
region are made mandatory. 相似文献
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近年来,Newmark累积位移分析方法经过不断的改进和应用成为国际主流的地震滑坡危险性评估方法之一,众多学者基于位移预测模型开展区域地震滑坡危险性评估,然而鲜有针对不同位移模型对评估结果影响的定量研究。以天水地区为例,基于不同的位移预测模型开展地震滑坡危险性评估,对比位移模型对地震滑坡危险性评估的影响,探讨建立适用于我国的Newmark位移预测模型。结果表明:基于不同位移预测模型评估所得的地震滑坡危险性结果整体趋势一致,均能区分区域地震滑坡危险性等级的相对差异,但在同样的危险性分级标准下,所得中、高危险区的分布范围有较大差异。这与位移模型的函数形式及其区域相关性有关,在引入Newmark累积位移分析方法开展地震滑坡危险性评估的同时,应尽快建立考虑地震动衰减特征和工程地质背景的Newmark位移预测模型,为中国潜在地震滑坡危险性预测评估、震后滑坡快速评估等提供技术支撑。 相似文献