A monitoring system for a field magnetometer was configured with assistance of a Raspberry Pi as a data logger. The suggested geomagnetic system uses a semi-real-time data transmission module. The system consists of two parts: a field-observation part and a data-center part. The field-observation part comprises a Raspberry Pi, magnetometer, LTE router, and power source, while the data center part takes samples at the site. The collected magnetometer data are then sent to the data center through the LTE router. The newly designed monitoring system was deployed and checked in Jeju-do island, and found to operate stably. The suggested system is promising in that it is simple and cost saving, providing at least physical insight and knowledge on the complex natural phenomena.

Abstract
 1. Introduction
 2. Automatic Magnetic Observation System
  2.1. Overview of system
  2.2. Hardware of automatic logger system
  2.3. Software of automatic logger system
 3. Field Experiment and Results
 4. Conclusions and Discussion
 Acknowledgements
 REFERENCES

• Eun-Kyeong Choi(GI Co. Ltd., Geo-Information Institute)
• Sung-Wook Kim(GI Co. Ltd., Geo-Information Institute)
• Jinwoo Cho(Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
• Khil-Ha Lee(Department of Civil Engineering, Daegu University) Corresponding author