Regional Wave Propagation in New England and New York
Regional Wave Propagation in New England and New York
复制标题
新英格兰和纽约的区域波传播
DOI：
10.1785/0120090223
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发表时间：
2010
影响因子：
3
通讯作者：
R. Abercrombie
中科院分区：
文献类型：
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作者：
Gisela M. Viegas;L. Baise;R. Abercrombie
我们使用 2002 年 4 月 20 日 M 5 Au Sable Forks 地震的地震图验证并改进了美国东北部两个主要地壳省份 (NEUS) 的一维速度模型，该地震是该地区由多个最近部署的优质区域宽带站记录的最大地震。为了预测和减轻美国东北部未来地震的影响，需要更多有关当地地震源以及地震波如何穿过该地区的信息。我们研究了金塞布尔福克斯地震的震源和区域波传播。地震震中位于阿巴拉契亚山脉（新英格兰）和格伦维尔（纽约）这两个不同地质省份的边界附近。我们使用正演建模方法来研究距震中 400 公里范围内 16 个台站记录的波形。我们使用频率波数方法生成合成地震图，测试了这两个省的几个已发布的模型。多种型号在低频（<0:1 Hz）下表现良好。我们改进了这些模型，并针对工程感兴趣的中频（<1 Hz）生成了两个替代的一维地壳模型。根据拟合优度统计数据：方差减少和相关系数，我们的新 Grenville 模型对于在该省建模的所有六个源站路径的性能优于之前发布的模型。我们的替代阿巴拉契亚模型改进了该省建模的 10 条路径中的 5 条的合成数据与数据的拟合度。从结果中，我们确定了波场复杂性的两个具体来源，在未来的 NEUS 地震地面运动研究中应进行调查：阿巴拉契亚省 3% 的方位各向异性和沿两省边界的复杂波路径。
We validate and improve 1D velocity models of the two main crustal provinces in the northeastern United States (NEUS), using seismograms from the 20 April 2002 M 5 Au Sable Forks earthquake, which is the largest earthquake in the region to be recorded by multiple, recently deployed, good-quality, regional broad- band stations. To predict and mitigate the effects of future earthquakes in the north- eastern United States, more information is needed regarding both the local earthquake sources and how seismic waves travel through the region. We investigate the source and regional wave propagation for the Au Sable Forks earthquake. The earthquake epicenter is located near the boundary of two distinct geological provinces, the Appalachian (New England) and Grenville (New York). We use a forward-modeling approach to study the waveforms recorded at 16 stations located within 400 km of the epicenter. We generate synthetic seismograms using the frequency-wavenumber method, testing several published models for the two provinces. Several models per- form well at low frequencies (<0:1 Hz). We refine these models and generate two alternative 1D crustal models for intermediate frequencies (<1 Hz) of engineering interest. Our new Grenville model performs better than previously published models for all six source-station paths modeled in that province according to goodness of fit statistics: variance reduction and correlation coefficient. Our alternative Appalachian model improves the fit of synthetics to data for five of the ten paths modeled in that province. From the results, we identify two specific sources of wave-field complex- ities that should be investigated in future studies of earthquake ground motions in NEUS: 3% azimuthal anisotropy in the Appalachian Province and complex wave paths along the boundary between the two provinces.
DOI：
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发表时间：
1975-10
期刊：
--
影响因子：
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作者：
H. Kanamori;D. L. Anderson
通讯作者：
H. Kanamori;D. L. Anderson
H.264编码器DCT的硬件实现及其评估
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Choong Geun Lee;V. G. Moshnyaga and K. Hashimoto;宮田康治
通讯作者：
宮田康治