PREFACE

Chapter1. Source Determination and Discrimination between Earthquakes and Artificial Explosions
1-1 Auto-pick Up Technology for Earthquakes in and around the Korean Peninsula Using Waveform Format Conversion and Composition
1-1-1 Introduction
1-1-2 Data Acquisition and FESNET Array
1-1-3 Basic Theory and Source Determination
1-1-4 Comparision of the Results from FESNET with Those of Other Arrays
1-1-5 Discussion and Conclusion
Reference

1-2 Study on Some Characteristics of Earthquakes and Explosions Using the Polarization Method
1-2-1 Introduction
1-2-2 Method and Analysis
1-2-3 Discussion and Conclusions
Reference

1-3 Uncertainties of Seismic Source Determination Using a 3-Component Single Station
1-3-1 Introduction
1-3-2 Azimuth Estimation and Its Uncertainty
1-3-3 Uncertainties from Subjective Causes: Selection of Waveforms and the Time-Direction Stacking Approach
1-3-4 Uncertainly of Epicenter Distance
1-3-5 Discussion and Conclusions
Reference

1-4 Empirical Analysis of Digital Seismograms from a Cluster of Explosions at Regional Distances for Characterizing Multiple Explosions
1-4-1 Introduction
1-4-2 Empirical Analysis of Digital Seismograms from Explosions at Regional Distances
1-4-3 Similarities of Seismograms from Nearby Explosions at Regional Distances
1-4-4 Characterizing a Possible Multiple Explosion Using Empirical Synthetic Seismograms
1-4-5 Discussion and Conclusions
Reference

1-5 Discrimination of Small Earthquakes and Artificial Explosions in the Korean Peninsula Using Pg/Lg Ratio
1-5-1 Introduction
1-5-2 Data
1-5-3 Data Analysis and Interpretation
1-5-4 Discussion and Conclusions
Reference

Chapter 2. Focal Mechanism Solution Using Moment Tensor Inversion
2-1 Introduction
2-2 Earthquake Data Collection and Analysis
2-3 Basic Theory of Moment Tensor Inversion
2-4 Non-unique Problems on Focal Mechanism Solution
2-5 Discussion and Conclusions
Reference

Chapter 3. Double-Difference Method (hypoDD) for Source Relocation
3-1 Introduction
3-2 Basic Theory of Double-difference Algorithm
3-3 Data Acquisition and Earthquake Relocation
3-4 Interpretation and Discussion of Results: Relationship between Focal Mechanism and Hypocenters redetermined by HypoDD
3-5 Discussion and Conclusions
Reference
Appendix 3
A3-1 Travel Times of P- and S-wave Arrivals for Southern Korea
A3-2 Input Parameter File for ph2dt Program
A3-3 Output Logfile for ph2dt Program
A3-4 Corrected Input Data for a Pair of Events for Southern Korea
A3-5 Input Parameter File for hypoDD Program
A3-6 Output Log File

Chapter 4. Seismic Tomograpcchy
4-1 P- and S-wave Tomographic Imaging of the Crust and Uppermost Mantle beneath the Korean Peninsula
4-1-1 Introduction
4-1-2 Data and Method
4-1-3 Results
4-1-4 Error analysis and resolution tests
4-1-5 Discussion
4-1-6 Conclusions
Reference
Appendix 4-1
A4-1-1 Flowchart of Tomography Algorithm
A4-1-2 Stations in and arround the Korean Peninsuls
A4-1-3 Initial Source Parameters and Travel Times for the Korean Peninsula

4-2 Tectonic Features of Plate Juncture in Hokkaido, Japan Derived from Local Tomographic Inversion of P- and S-wave Travel Times
4-2-1 Introduction
4-2-2 Tectonic Setting
4-2-3 Data Acquisition and Analysis
4-2-4 Basic Theory of Inversion Algorithm
4-2-5 Interpretation of the Results
4-2-6 Error and Resolution Analysis
4-2-7 Discussion and Conclusion
Reference
Appendix 4-2
A4-2-1 The L1-norm
A4-2-2 Bouguer gravity map of Hokkaido, Japan
A4-2-3 Geology of Hokkaido

4-3 Changes in Ascent of Magma Body Batch Before and After Eruptions in Mt. Usu and Tokachi-dake, Hokkaido, Japan Using Volcanic Tomography
4-3-1 Introduction
4-3-2 Data Acquisition and Analysis
4-3-3 Geological and Geophysical Information
4-3-4 Basic Theory of Algorithm
4-3-5 Interpretation of Velocity Anomalies of Vp, Vs and Vp/Vs
4-3-6 Error and Resolution Analysis
4-3-7 Discussion and Conclusions
Reference
Appendix 4-3
A4-3-1 Construction of Matrix M × N(Amn) and Ax＝u for Volcanic Tomography
A4-3-2 CPU Times for Calculation for Each Region
A4-3-3 Input Parameters for Each Region
A4-3-4 Computer Output for Tokachi-dake
A4-3-5 Determination of Ray-density and Node for Tokachi-dake
A4-3-6 Computation of Various for Inverse Problems in Tokachi-dake
A4-3-7 Analysis of Error Reduction Rate for Tokachi-dake in Invbig.f

Chapter 5. Seismotechtonics of Mongolia Based on Earthquake Catalogue and Focal Mechanism
5-1 Introduction
5-2 Earthquake Catalogue of Mongolia
5-3 Seismicity and Seismic Hazard Evaluation of Mongolia
5-4 Focal Mechanism Solutions and Tectonics of Mongolia
5-5 Discussion and Conclusions
Reference
Appendix 5
A5-1 Earthquake Catalogue of Mongolia

INDEX