Active Geophysical Monitoring

CHAPTER 10

EM-ACROSS SYSTEM AND CORRESPONDING TENSOR TRANSFER FUNCTIONS IN DIFFUSION FIELD REGION

Takahiro Nakajima^a, Takahiro Kunitomo^a, Hiromichi Nagao^a,b, Mineo Kumazaw^a,c, andNaotaka Shigeta^a,d

Contents

1. Introduction

2. Basic Equations for the Electromagnetic Field and the Transfer Function in EM-ACROSS

3. The EM-ACROSS Observation System

4. Results of the Trial Observation

5. Properties of the Transfer Function

5.1. Static tensor properties of the transfer function and the information on the underground conditions

5.2. Temporal variations

6. Conclusions

References

1. INTRODUCTION

Following the suggestion by Ogawa and Kumazawa (1996), Kumazawa et al. (2000), an electromagnetic method was developed for ACROSS (EM-ACROSS). The propagation ...