|Surian ng Pilipinas sa Bulkanolohiya at Sismolohiya|
|Formed||September 17, 1982|
|Headquarters||C.P. Garcia Avenue, UP Campus, Diliman, Quezon City|
|Annual budget||₱529.18 million (2021)|
|Parent agency||Department of Science and Technology|
The Philippine Institute of Volcanology and Seismology (PHIVOLCS, Tagalog: [ˈfivolks]; Filipino: Surian ng Pilipinas sa Bulkanolohiya at Sismolohiya) is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and tsunamis, as well as other specialized information and services primarily for the protection of life and property and in support of economic, productivity, and sustainable development. It is one of the service agencies of the Department of Science and Technology.
PHIVOLCS monitors volcano, earthquake, and tsunami activity, and issues warnings as necessary. It is mandated to mitigate disasters that may arise from such volcanic eruptions, earthquakes, tsunamis, and other related geotectonic phenomena.
This government organization was formed after a historical merging of official functions of government institutions.
One of its first predecessors is the Philippine Weather Bureau created in 1901 when meteorological, seismological and terrestrial magnetic services of the Manila Observatory were transferred from the Roman Catholic Church to the American Colonial Government. It performed earthquake monitoring in the country and has inherited and maintained the early earthquake catalogue at that time. By 1972, the Philippine Weather Bureau was reorganized under Presidential Decree No. 78 into the Philippine Atmospheric Geophysical and Astronomical Services Administration (PAGASA). A UNDP-funded project for PAGASA established a twelve-station earthquake monitoring network in the country.
The other predecessor to PHIVOLCS, the Commission on Volcanology (COMVOL) was created on June 20, 1952 by Republic Act no. 766 after the disastrous eruption of Hibok-Hibok Volcano in June 1952. Under Executive Order no. 784 of March 17, 1982, the umbrella department of COMVOL, the National Science Development Board (NSDB) was reorganized into the National Science and Technology Authority (NSTA), and COMVOL was restructured to become the Philippine Institute of Volcanology or PHIVOLC.
The seismological arm of PAGASA was officially transferred to PHIVOLC on September 17, 1984 through Executive Order No. 984, renaming the institute as the Philippines Institute of Volcanology and Seismology or PHIVOLCS. NSTA, the umbrella department for PHIVOLCS and PAGASA, became the Department of Science and Technology (DOST) in 1987. The technical staff and the 12-station earthquake monitoring network was fully integrated to PHIVOLCS in 1988.
PHILVOCS and the United States Geological Survey collaborated during the 1991 eruption of Mount Pinatubo. Their forecast provided the timely evacuation of military personnel and residents that were affected by the eruption.
The Philippine Institute of Volcanology and Seismology provides a classification system for the volcanoes of the country.