Geomagnetic Data Quality at Indonesian Geomagnetic
(1) , Kathryn A. Whaler (2), Christopher W. Turbitt (3), Ciaran Beggan
Meteorlogi Klimatologi dan Geofisika, Indonesia. (2) University of
Edinburgh, UK. (3) British Geological Survey, UK.
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