Active Geophysical Monitoring

CHAPTER 24

ACTIVE SEISMIC MONITORING OF THE SAN ANDREAS FAULT AT PARKFIELD

Valeri A. Korneev^a and Robert M. Nadeau^b

Contents

1. Introduction

2. HRSN

3. Vibroseis Monitoring

4. Origin of Changes

5. Guided-Wave Imaging of SAF Core

6. Fault Continuity Testing

7. Discussion and Conclusions

Acknowledgments

References

1. INTRODUCTION

The town of Parkfield, located on the San Andreas Fault in central California has been the site of intensive multidisciplinary earthquake studies since the 1970s. Moderate-sized earthquakes of about magnitude 6 have occurred on the Parkfield section of the San Andreas Fault at fairly regular intervals—in 1857, 1881, 1901, 1922, 1934, and 1966. The 1857 event was a foreshock of the great Fort Tejon earthquake (magnitude ...