The IMAGE passive seismic project on Reykjanes peninsula, Iceland

1. The IMAGE passive seismic project on Reykjanes
peninsula, Iceland
GEORG Geothermal Workshop 2016, Reykjavík
Hanna Blanck, 24.11.2016

2. The Network

3. Seismometer setup

4. OBS deployment

5. First results

6. DAS (distributed acoustic sensing) technology
− Passive sensor cable
− Only the fiber optic cable is subject to the temperatures in the borehole
− Higher temperature tolerance than conventional sensors
− Possible recording in > 200°C
− Simulteneous data aquisition over long distances (several km)
− Sampling with high spatial and temporal resolution
− Test of DAS method for borehole and surface seismic measurements
− 9 days of recording
− Active shots and passive recording

7. The measurement princible
seismic
wave

8. The measurement princible
laser pulse
seismic
wave

9. The measurement princible
laser pulse
seismic
wave
backscattered
light

10. The measurement princible
laser pulse
seismic
wave
backscattered
light

11. The measurement princible
laser pulse
seismic
wave
backscattered
light
phase shifted

12. Cable installation

13. Active recordings
- Hammer seismics
- Distance along fiber calculated from
signal travel time
- hammer shots every 250 to 500 m
along the surface cable
- to locate individual traces for spatial
distribution

14. Summary/Outlook
- 2066 earthquakes recorded in 16 month
- Tomographic studies are ongoing
- DAS technology is well suited to monitor seismic signals in magmatic
environments
- Focal mechanisms (ÍSOR)
- Ambient noise techniques (GFZ, TNO)
- Seismic interferometry (TNO)

15. Summary/Outlook
- 2066 earthquakes recorded in 16 month
- Tomographic studies are ongoing
- DAS technology is well suited to monitor seismic signals in magmatic
environments
- Focal mechanisms (ÍSOR)
- Ambient noise techniques (GFZ, TNO)
- Seismic interferometry (TNO)
Questions?