Tectonics or magma intrusion?-- new results from multi-parameter studyat Gede Volcano, West Java, IndonesiaD Hidayat1, H G...
Gede Volcano,West Java,Indonesia      JAKARTA                                           Danau  BOGOR                      ...
Eruptive history of GedeSeismic behaviorat Gede
Monitoring Scheme          Initial no of station: 2 (1-component)                           Currently: 9 stations (3 compo...
Example of data   Drumplot during normal period                        Drumplot during swarm
Locatable VT at and around Gede Volcano May 2011– Aug 2012                                              no report
Gede Hypocenters May 2011 – 26 Feb 2012
ede Hypocenters during swarm 27 Feb- 9 Apr 2012
Gede Hypocenters Aug 2012
Receiver function study reveals2 low velocity zones under Gede
Gede Hypocenters during swarm vs Results from Receiver Function Study
Comparison with previous swarmHypocenters of 1997 swarm    Hypocenters of 2012 swarm
Tilt time-seriesDeformation monitoring bytiltmeters Jun-Jul 2011                            Tilt vector
Tilt time-seriesDeformation monitoring bytiltmeters (Nov 2011-Feb 2012)                                 Tilt vector 11/201...
Tilt time-seriesDeformation monitoring bytiltmeters (27 Feb ’12-Jun ‘12)                                  Tilt vector
Tilt time-seriesDeformation monitoring bytiltmeters (Aug-Sep 2012)                            Tilt vector
Flank CO2 flux measurement campaignsHighlight: 2011 NE sector: higher CO2 activity                                        ...
Possible source causing the earthquakes:-tectonic related earthquakes (faulting)-DVT (distal VT)
Concluding Remarks-Prior to the swarm in Feb-Mar 2012 and Aug 2012, sequences ofsmall earthquakes occurred along NE-SW acr...
Thank you
Upcoming SlideShare
Loading in …5
×

Tectonics or magma intrusion? New results from multi-parameter study at Gede Volcano, West Java, Indonesia, by Danny Hidayat

1,776 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,776
On SlideShare
0
From Embeds
0
Number of Embeds
7
Actions
Shares
0
Downloads
8
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Tectonics or magma intrusion? New results from multi-parameter study at Gede Volcano, West Java, Indonesia, by Danny Hidayat

  1. 1. Tectonics or magma intrusion?-- new results from multi-parameter studyat Gede Volcano, West Java, IndonesiaD Hidayat1, H Gunawan2, M Hendrasto2, A Basuki2, F Schwandner1, S Marcial1, SKunrat21 Earth Observatory of Singapore, Nanyang Technological University2 Center for Volcanology and Geological Hazard Mitigation, Indonesia
  2. 2. Gede Volcano,West Java,Indonesia JAKARTA Danau BOGOR Jatiluhur Pangrango ©2009 Google – Map Data ©2009 and Europa Technologies
  3. 3. Eruptive history of GedeSeismic behaviorat Gede
  4. 4. Monitoring Scheme Initial no of station: 2 (1-component) Currently: 9 stations (3 components:For Gede & Salak Volcanoes BB and short period) Planned: 1 CO2 flux monitoring PUN
  5. 5. Example of data Drumplot during normal period Drumplot during swarm
  6. 6. Locatable VT at and around Gede Volcano May 2011– Aug 2012 no report
  7. 7. Gede Hypocenters May 2011 – 26 Feb 2012
  8. 8. ede Hypocenters during swarm 27 Feb- 9 Apr 2012
  9. 9. Gede Hypocenters Aug 2012
  10. 10. Receiver function study reveals2 low velocity zones under Gede
  11. 11. Gede Hypocenters during swarm vs Results from Receiver Function Study
  12. 12. Comparison with previous swarmHypocenters of 1997 swarm Hypocenters of 2012 swarm
  13. 13. Tilt time-seriesDeformation monitoring bytiltmeters Jun-Jul 2011 Tilt vector
  14. 14. Tilt time-seriesDeformation monitoring bytiltmeters (Nov 2011-Feb 2012) Tilt vector 11/2011 – 26/02/2012
  15. 15. Tilt time-seriesDeformation monitoring bytiltmeters (27 Feb ’12-Jun ‘12) Tilt vector
  16. 16. Tilt time-seriesDeformation monitoring bytiltmeters (Aug-Sep 2012) Tilt vector
  17. 17. Flank CO2 flux measurement campaignsHighlight: 2011 NE sector: higher CO2 activity 2011-2012 flank CO2 flux : •Campaigns: • May, Sept 2011 (n 134) • March 2012 (n 40) •Method: • high resolution CO2 accumulation chamber (LICOR Li8100A) • ~10 points/day, >3/site •Results [CO2 g/m2/d]: • 019.8 mean (2011) 112.5 max (2011) • 011.7 mean (2012) 043.4 max (2012) Compare flanks Gede -Merapi mean ~40, max ~120 g/m2/day (9/2002 at Woro) Toutain et al. 2002, Figs.1,8
  18. 18. Possible source causing the earthquakes:-tectonic related earthquakes (faulting)-DVT (distal VT)
  19. 19. Concluding Remarks-Prior to the swarm in Feb-Mar 2012 and Aug 2012, sequences ofsmall earthquakes occurred along NE-SW across Gede andPangrango.-A short VT swarms occurred 27 Feb-8 Mar 2012. We postulatesthat there may be a magma intrusion under Gede volcano but donot lead to any eruption. Similar swarms occurred in 1997 werelocated under Gede Volcano.-Tilt data suggest deformation is controlled by local tectonic untilearly Nov 2011. Then tilt vector change suggests inflation due to(possibly) magma intrusion, followed by swarm of earthquakes at theend of Feb 2012. Several months later tilt data is back to NEdirection. While CO2 flux measurements around Gede suggest somehigh flux around NE from the volcano.-Gede & Salak activity need to be continously monitored with multi-parameter stations as any larger swarm, deformation, or gas fluxchanges may lead to surface activity (eruption) which will affectpeople living around the volcano.
  20. 20. Thank you

×