IGUANA Field Work   [contents]   Page 25 of 26

Seismicity of the Archipelago: Preliminary Results High Frequency Seismograms Seismograms of local activity      Examples of local events registered on the three components of station G06, and filtered highpass 1Hz. Left panel shows the mb 5.0 event, middle panel shows a shallow volcano-tectonic event beneath Alcedo Volcano, and the right panel shows a high frequency signal (3-7Hz), that may correspond to volcanic tremor. The appearance of the latter event on four of our seismometers indicates a location on nothern Isabela (Volcano Alcedo?).

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Contents

• Installing Broadband Seismometers on the Islands
1. Lugging equipment on Fernandina
2. Preparing a site on San Cristobal
3. Aligning the seismometer
4. Placing the seismometer in a vault
5. Finished site
• Installing High Frequency Seismometers on the Islands
6. Hiking in on Bartoleme
7. Working on equipment
8. A view of a rough site and smooth waters
• People and Geology
9. Doug Toomey and Fernandina
10. Darwin Villagomez on Pinta
11. Pahoehoe of Fernandina
12. Anniversary Celebration
13. Spatter Cones of Bartolome
• Exotic Sights near the Sites
14. Cinder Cone on Isabela
15. Foreplay at the Tortiose Breeding Center
16. Marine Iguana
17. Land Iguana
18. Marine Iguana and Espanola
19. Marine Iguana of Espanola
20. Juvenile Booby on Nest
21. California Sea Lions
• Seismicity of the Archipelago: Preliminary Results
22. Regional Seismicity
23. Map of Seismic Array
24. Broadband Seismograms
25. High Frequency Seismograms
26. Distribution of Seismicity