| Title | Deformation in the Leyte Geothermal Production Field, Philippines Between 1991 and 1999 |
|---|---|
| Authors | J.P.L. Catane, H. Kanbara, K. Obara, N. Suguira, K. Hirose, R.E.R. Olivar, J. Salvador, M. Litua±as, A. Dupio and A. Lanuza |
| Year | 2000 |
| Conference | PNOC-EDC Geothermal Conference |
| Keywords | |
| 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. |