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| Titel |
Passive seismic monitoring studies at Tiris geothermal field in East Java, Indonesia |
| VerfasserIn |
Makky Jaya, Philippe Jousset, Fiorenza Deon, Alexandra Gassner, Dewi Putriatni, Supoyo Supoyo, Agus Suprianto, Tri Putra, Kemal Erbas |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084426
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| Zusammenfassung |
| The Tiris geothermal field (TGF) is indicated by the presence of two sets of surface warm
springs located within the proximity of two volcanoes: Mt. Lamongan and Mt.
Argopuro. Preliminary assessment of TGF in terms of petrology of the volcanic rock and
geochemistry of springs has been studied by Deon et al. (2012). The combination of
petrology and geochemistry studies suggests: 1) the relation between sea water and the
origin of warm springs and 2) the existence of a concealed layer responsible for
capturing H2S gas which, in turn, accounts to the observed HCO3- excess of the
springs.
In order to support hypotheses resulting from those petrology and geochemistry studies, two
passive seismic field experiments have been deployed successively. The first small-scale
seismic noise study in 2011 was carried out by setting up 5 geophones for 5-days monitoring
positioned around Mt. Lamongan. The second larger-scale passive seismic study has been
performed since October 2012 setting up 16 short period stations and 4 broad-band stations
around TGF for 6 months monitoring period. The goal of preliminary seismic noise
test in 2011 was to identify pre-dominant noise characteristics in the area, while
passive seismic monitoring in 2012 attempts to reveal the underground geologic
structure of TGF derived from seismic properties. We report the set-up of both
experiments and describe first result of seismic noise analysis and preliminary monitoring
analysis.
References
Deon, F.; Moeck, I.; Scheytt, T.; Jaya, M.S. (2012): Preliminary assessment of the geothermal
system of the Tiris colcanic area, East Java, Indonesia. 74th EAGE Conference & Exhibition
(Copenhagen, Denmark 2012). |
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