| Title | Deformation in the Leyte Geothermal Production Field, Philippines Between 1991 and 1999 |
|---|---|
| Authors | John Patrick Catane, Hiroshi Kanbara, Ken Obara, Kazuyo Hirose, Rhoel Enrico Olivar, Jerry Salvador, Michael Lituanas, Armando Dupio, Angelito Lanuza and Norikiyo Sugiura |
| Year | 2000 |
| Conference | World Geothermal Congress |
| Keywords | deformation, Philippine Fault, Leyte Geothermal Production Field, Global Positioning System, seismic hazard |
| Abstract | Global Positioning System (GPS) observations in Central Leyte, eastern Philippines, from 1991 to 1999 indicate considerable deformation along a segment of the Philippine Fault that cuts through the Leyte geothermal production field. Displacements computed at 9 core stations within the field, from 1991 to 1994, depict a left-lateral slip rate of about 2.6 cm/yr. A GPS survey conducted in 1998 at 10 sites within the geothermal field reveals the occurrence of a lower slip rate of about 1.3 cm/yr between the intervals 1994-1999. Though this suggests that less deformation has occurred during the last 4 years, our current GPS observations probably underestimate the true deformation field within the area. There is a need to apply network adjustments and address the problem of measurement uncertainties to our GPS data. The most recent GPS campaign forms part of a multi-agency project between the Philippines and Japan and is intended to complement results derived from SAR interferometry in studying crustal deformation and geologic hazards in the island of Leyte. |