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Weak Zones Delineation Using Single Component Electromagnetics and Seismicity Methods in Geothermal Interest Area
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Recent geological discoveries revealed that Karangsambung has a complex tectonic framework associated with the evolution of Java Island - Indonesia, in which led further geological and geophysical research specified in this region. Another geological interest has arisen such geothermal manifestation emerged in form of hot spring in Krakal, a village located southern of Karangsambung. Locally Krakal hot spring settled at the top of claystone unit member of Panosogan formation without in addition of geothermal minerals alteration that generally occurs on geothermal manifestation area. Prior to the lack of geological data, geologists tend to construct preliminary interpretation which is less representative to the current manifestation findings. An earlier hypothesis states that the regional structures may control the local weak zones which later became a geothermal interest zone. The geophysical preliminary survey was conducted in order to delineate subsurface structures and mineralization boundaries indication. The research involves two geophysical methods which are electromagnetic and seismicity methods. The electromagnetic methods consist of Very Low Frequency (VLF) & Conductivity-Meter Direct (CMD) to determine potential shallow structural and mineralization boundaries and seismicity method practices Microseismic to determine structure controlled weak zones.