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  • Seismological Society of America (SSA)  (1)
  • Singapore :Springer Singapore Pte. Limited,  (1)
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  • 1
    Online Resource
    Online Resource
    Singapore :Springer Singapore Pte. Limited,
    Keywords: Geology, Structural. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (115 pages)
    Edition: 1st ed.
    ISBN: 9789811050688
    Series Statement: Springer Theses Series
    DDC: 551.22
    Language: English
    Note: Intro -- Supervisor's Foreword -- Abstract -- Parts of this thesis have been published in the following journal articles: -- Acknowledgements -- Contents -- List of Figures -- List of Tables -- 1 Introduction -- 1.1 Isotropic Seismic Tomography in Taiwan -- 1.2 Anisotropic Seismic Tomography in Southern California -- References -- 2 Assessment of Tomography Models of Taiwan Using First-Arrival Times from the TAIGER Active-Source Experiment -- 2.1 Introduction -- 2.2 Observations of First-Arrival Times -- 2.2.1 Picking Onset Times from Waveform Records and Removing Elevation Effect -- 2.2.2 Elevation-Adjusted First-Arrival Times -- 2.3 Model Predictions of First-Arrival Times -- 2.3.1 Regional Models for Taiwan -- 2.3.2 Numerical Simulations -- 2.4 Comparisons Between Observed and Model-Predicted First-Arrival Times -- 2.5 Summary -- References -- 3 Crustal Velocity Variations in Taiwan Revealed by Active-Source Seismic Observations -- 3.1 Introduction -- 3.2 Data: Active-Source First-Arrival Times -- 3.3 2D Profiles of P-Wave Velocity Structure -- 3.3.1 Ray Tracing Modelling for Constructing 2D Models -- 3.3.2 2D P-Wave Velocity Profiles Across Taiwan -- 3.3.3 2D P-Wave Velocity Profiles in Northern Taiwan -- 3.4 3D Model of Northern Taiwan -- 3.4.1 Partition Modelling Tomography -- 3.4.2 Stabilization of the Ensemble Average Model -- 3.4.3 Resolution Tests -- 3.4.4 3D Model for Northern Taiwan -- 3.4.5 Correlation with Tectonic Provinces -- 3.4.6 Comparisons with Three Recent Tomography Models -- 3.5 Conclusion -- References -- 4 Full-Wave Effects on Shear-Wave Splitting -- 4.1 Introduction -- 4.2 Full-Wave Sensitivity of Splitting Intensity to Anisotropy -- 4.3 Full-Wave Effects on SKS Splitting Intensity -- 4.4 Conclusion -- References -- 5 Full-Wave Multiscale Anisotropy Tomography in Southern California -- 5.1 Introduction. , 5.2 Splitting Intensity Measurements and Full-Wave Sensitivity Kernels -- 5.3 Multiscale Inversion -- 5.4 Result and Discussion -- 5.5 Conclusion -- References -- 6 Concluding Remarks -- References.
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  • 2
    Publication Date: 2011-04-01
    Description: 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 first-arrival 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.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
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