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Improvement of Geomagnetic Data Quality at Indonesian Geomagnetic Observatories |
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Relly Margiono (1) , Kathryn A. Whaler (2), Christopher W. Turbitt (3), Ciaran Beggan (3) |
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(1) Badan Meteorlogi Klimatologi dan Geofisika, Indonesia. (2) University of Edinburgh, UK. (3) British Geological Survey, UK. |
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Measurement of the geomagnetic field in Indonesia region is undertaken by Meteorology Climatology and Geophysics Agency (BMKG). The routine activities are to find declination, inclination and total field using absolute and variation measurement in each observatory. The oldest observatory is Tangerang (TNG) that started in 1964, then Tuntungan (TUN) in 1980, Tondano (TND) in 1990, Pelabuhan Ratu (PLR) and Kupang (KPG) in 2000, Jayapura (JAY) in 2012.
Presently, geomagnetic data at Indonesia are utilized not only for monitoring of geomagnetic field but also for earthquake monitoring, especially for earthquake precursor. Because of it is, the quality of measurement needs to be better than before and fulfill a high scientific standard. Without high accuracy measurement, the result would be far from the expectation. The sensible way to obtain good quality is follow guidelines INTERMAGNET as the institution that advises on geomagnetic observatory data and networks around the world. INTERMAGNET has several requirements for an observatory that wants to join in this network. For that reason, Indonesian geomagnetic observatory data need improvement to reach the standard.
The aim of this project is to improve the quality of Indonesian geomagnetic observatory data in terms of raw data produced, processing, and post-processing until the INTERMAGNET standard is reached. After the data produced to reach the standard, some geomagnetic data applications are applied to the data to contribute to the science community. In this research, geomagnetic data from six geomagnetic observatories are utilized and brief analysis of data quality are displayed for each observatory using geomagnetic data processing method such as delta F plot, baseline stability and annual means review. |