A. Simanjuntak¹ , M. Umar² , M. Muzli³ , A. Khaliyah⁴ , W. Ayu Ningsih⁴ , A. Jihad¹ , S. Wei³ , N. Nita⁵

¹Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG)
²Tsunami Disaster Mitigation and Research Center (TDMRC)
³Earth Observatory of Singapore (EOS)
⁴Syiah Kuala University
⁵Bandung Institute of Technology

Abstract:

Southeast Aceh is one of the most seismically active regions due to the existence of the subduction zone and the Great Sumateran Fault. Some historical devastating earthquakes with magnitude range 5 – 7 occurred in 1965, 1980, 1997, 2008 and 2010, and could make intensity 4 – 7 MMI. To know the seismic activity, we have deployed 7 seismometers, 3 short periods and 4 broadbands, adding to the stations from BMKG and CTBTO network for 6 months from August 2018 until March 2019. Data were downloaded every 2 months. After 4 months of recording, to get the preliminary results, we downloaded, investigated and analysed the waveform and found 900 events using the STA/LTA method. In the result we found that the hypocentre distribution occurred and spreaded more in the southern part than in the northern part. Because of that, we rotated 3 sensors close to the southern part, to minimize the azimuth coverage and get a high raypath. We also conducted a microtremor survey to know the surface condition. We took 25 point and analysed the H/V to get the dominant parameter. From H/V results it is seen that the surface condition can be inhabited and is not too influenced by microwaves.