PINATUBO VOLCANO

Alert Level	Monitoring Network
Hazard Map	Volcano Observatory

NAME OF VOLCANO:                        PINATUBO

LOCATION:                                         Boundaries of Pampanga, Tarlac and Zambales 

                                                             (15°08.4’ N, 120°21’ E)

PHYSICAL FEATURES

Elevation:  1.445 km (height before eruption was 1.745 km)       

Base Diameter:  40 km                                          

Type of Volcano:  Compound

Caldera Lake:  Pinatubo Crater Lake  (2 km in diameter and depth of 600 to 800 meters)   

Adjacent Volcanic Edifice:   Quadrado, Malasimbo, Balakibok, Negron

GEOLOGICAL FEATURES

Rock Type:  Dacite with andesitic xenoliths, inclusions       

Tectonic Setting:  Western Bataan Lineament      

Age of Deposits:  1.10+0.09 Ma; 635+80 B.P; 1991;1992

VOLCANIC ACTIVITY

Number of Historical Eruptions:  2

Eruption dates:

1991 June 9  to  Sept. 4 - Plinian, calderagenic

1992 July 9  to  Aug. 16 - Dome building, phreatic

Eruption Type:

1.      Plinian (e.g. 1991 eruption)

2.      Dome formation (e.g. 1992 eruption)

3.      Phreatic (e.g. 1992 eruption)

Precursors to Eruptions:

1.      increase in sulfur dioxide flux

2.      increase in seismic activity

3.      Increase steaming activity

VOLCANIC HAZARDS

Type of Hazards: pyroclastic flows, airfall tephra and ashfall,  lahars, secondary explosions,

                               secondary pyroclastic flows

Permanent Danger Zone:  ten (10) km radius from the summit

Other Buffer Zones:  20-40 km radius (Alert Level 5)

MONITORING ACTIVITY

Volcano Observatory:  Pinatubo Volcano Observatory, Clark Air Base (PVO-CAB) - located at

                                       120°31.69’E, 15°11. 18’N

Monitoring Methods:  Seismic and visual observations, sulfur dioxide flux measurement

Monitoring Stations:

PIN (PVO-CAB) Receiving & Central Recording Station)

VPCZ Remote Seismic Station

CRAT R Repeater Site

VPOD (Odonnel) Repeater Site

MAPAGLA R (Upper Tarukan) Repeater Site

VPP2 Remote Seismic Station & Repeater Site

MIDWAY R Repeater Site

DELTA 5 R Repeater Site

BOCOY R (Upper Mactan) Repeater Site

PDMZ (Mt. Cutuno) Remote Seismic Station