摘要
本文首先介绍了国内外有关震动图研究方面的动态。针对国内大部分地区的地震监测台网密度还比较低的现状,在已知震源位置和发震时刻的前提下,作者提出了利用实际地震台网观测资料近实时插值计算网格点处地震图的方法,在插值计算时充分考虑地震波在时间上的传播特征及在空间上的衰减规律。随后,对该方法的适用性进行了验证。以0.05°(约5Km)为尺度先对整个福建地区进行网格化划分,并以顺昌ML4.9级地震为例采用以上方法计算得到所有网格点处的地震时程。随后以1s为间隔,分别得到该时间间隔内的最大值等值线图,最后将所有的等值线图连续播放,得到了一种新形式的"ShakeMap"。作者还给出了顺昌地震最终的峰值地震动(PGV、PGA)分布,并分别对实际记录最大值及插值记录最大值随震中距的衰减关系进行了对比分析,结果充分证实了本文结果的可靠性。
In this paper, we introduce the research trends density of the seismic monitoring stations in most area of interpolation method based on few station＇s of an earthquake. During the interpolation, that related to ShakeMap. Because of the low our country, information if we already knew we propose a near real-time the epicenter and origin time we fully considered the wave propagation rule and amplitude attenuation law. Then, we test the suitability of this method by take the Shunchang ML 4.9 earthquake as an example. We grid the Fujian region with 0.05 degree, then calculate the time history in each grid node use our method. Every 1 second, we can get a contour picture of the peak value, then play all these pictures together and generate a new form of ShakeMap.The author also shows the final distribution of PGV and PGA, and compares the attenuation relation of peak values between interpolation results and station＇s record. In summary, these results confirm our method and show a reliable performance.
出处
《防灾减灾学报》
2010年第1期1-11,共11页
Journal of Disaster Prevention And Reduction
关键词
震动图
插值
衰减
ShakeMap
interpolation
attenuation
