Active Geophysical Monitoring

CHAPTER 15

DEVELOPMENT OF SIMULATION ALGORITHM FOR ANALYZING TEMPORAL STABILITY OF ACROSS SEISMIC SOURCE

Masayuki Saeki^a, Koshun Yamaoka^b, and Ryoya Ikuta^c

Contents

1. Introduction

2. Brief Review of Observed Temporal Variations of Near Field Responses

2.1. Temporal variations observed at Awaji Island

2.2. Relatively stable responses in a large tunnel at the Kazunogawa site

2.3. Discussions about the observed results

3. Development of Simulation Algorithm of ACROSS Seismic Waves

3.1. Simulation model

3.2. Displacements excited by a horizontally forced rigid circular disk deployed on a multilayered elastic half space

3.3. Compliance function

4. Numerical Simulation

4.1. Effect of the thickness of the surface layer on the source’s rigid motion ...