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首页> 外文期刊>Bulletin of the Seismological Society of America >Assessment of tomography models of Taiwan using first-arrival times from the TAIGER active-source experiment
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Assessment of tomography models of Taiwan using first-arrival times from the TAIGER active-source experiment

机译：使用TAIGER主动源实验的首次到达时间评估台湾层析成像模型

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In 2008, the TAiwan Integrated GEodynamics Research (TAIGER) project conducted an active-source experiment in which seismic records from 10 explosions were collected at nearly 1400 locations on the island of Taiwan. We use the first-arrival times manually picked from the explosion records to examine the P-wave travel-time variations resulting from the complex crust and uppermost mantle structures beneath Taiwan. Distributions of the observed first-arrival times exhibit characteristic patterns associated with vertical and lateral velocity variations present in different tectonic domains in the region. Aided by numerical simulations, we compare the observed first-arrival times with those predicted from a one-dimensional (1D) model and three three-dimensional (3D) tomography models for Taiwan that portray the underlying variations in seismic wave speeds frequently utilized to decipher the regional tectonic framework in Taiwan. We evaluate the quality of the four models by the goodness of fit between the observed and model-predicted travel times that demonstrates significant improvement of the 3D models over the 1D model. Statistical distributions of the differential travel-time residuals allow us to inspect quantitatively the overall effectiveness of these models in replicating the observed ground-truth firstarrival times so as to make an assessment of the strength and deficiency of the resolved velocity structures that agree with or contradict the travel-time observations from the explosion experiment.
机译：2008年，台湾台地综合地球动力学研究（TAIGER）项目进行了主动源实验，在台湾岛的近1400个地点收集了10次爆炸的地震记录。我们使用从爆炸记录中手动选取的首次到达时间来检查由台湾以下复杂的地壳和最上层的地幔结构导致的P波传播时间变化。观测到的首次到达时间的分布表现出与该区域不同构造域中存在的垂直和横向速度变化相关的特征模式。在数值模拟的帮助下，我们将观测到的首次到达时间与台湾的一维（1D）层析成像模型和三个三维（3D）层析成像模型预测的首次到达时间进行了比较，这些模型描绘了经常用于解密的地震波速度的潜在变化台湾的区域构造框架。我们通过观察的和模型预测的旅行时间之间的拟合优度来评估四个模型的质量，这证明了3D模型相对于1D模型的显着改进。差分旅行时间残差的统计分布使我们能够定量检查这些模型在复制观测到的地面真实首次到达时间方面的整体有效性，从而评估与速度一致或矛盾的分解速度结构的强度和不足。爆炸实验的旅行时间观测值。

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