By June 9, officials had ordered 25, people out of the area. The Mount Pinatubo eruption provides an excellent example of how accurate forecasting and timely warning saved lives from the destructive agents unleashed by a violent eruption. Evacuation orders were issued by concerned Disaster Coordinating Councils or local government officials soon after danger zones were declared on April 7, June 7, and June , Seismic activity during this period became intense. The alert level-danger zone association, though not intentionally established, lingered, so that when Alert Levels 4 and 5 were released in , an understandable reaction was to react as in and evacuate the to km danger zone.
Either the information drive launched by PHIVOLCS and other disaster response organizations before the eruption did not reach these respondents or the information campaign failed to drive home to them the magnitude of the threat and the urgency as well as the possibility of avoiding the volcano's fury. Receipt of eruption warning and evacuation order by date. Communities in which LAKAS, an organization of the indigenous Aetas, was active showed the most exemplary operation of the system:transmission was total and response was consistently appropriate. But a big part of the Pinatubo evacuation's success is owed to the volcano's timing, Hoblitt said. Everyone agreed that if there were an evacuation, people must be moved to an area where they would be safe—not statistically safe, but perfectly safe. Households that evacuated selectively either 1 sent their women, children, sick and elderly to safety while the able-bodied adult males stayed behind or 2 evacuated all together but then allowed some member s of the household to return home usually during daytime.
One of the holdouts compromised by sending his family not to an evacuation center but to a place a bit farther away from the volcano, saying "Hindi naman daw kami aabutan ng pagputok ng bundok" "We heard that the eruption will not reach us" Cortes,
Among those who took other defensive action table 9 , some overreacted by suspending their normal activities, such as going to school or going to work, for 1 to several days.
They rode out the night 24 miles 38 km away at an agricultural college, feeling the earth quake as Pinatubo's summit collapsed into a 1. In , Alert Level 4 was associated with a km danger zone, and Alert Level 5 was associated with both a km and a km danger zone. The DCCs, in turn, transmit the warning to those at risk and respond in various other ways. At the time, the population of Clark and nearby cities of Angeles, Sapangbato, Dau and Mabalacat numbered about ,
Over the next three days, the volcano spit out three more vertical eruptions and 13 smaller eruptions that produced pyroclastic flows molten mixtures of ash, gas and rock that can sweep over the landscape at more than 60 miles km per hour. It was a success that helped cement the importance of close volcano-watching — though scientists are still searching for the unique clues that might warn them that an eruption will be as large as Pinatubo's. Table 8 lists some of the reasons given by those who dallied or evacuated selectively. Periods with a positive AO phase in the troposphere are associated with strengthening of the polar night jet in the lower stratosphere and growing negative anomaly of the 50 hPa geopotential height in the North Pole region [ Graf et al. If the huge volcanic eruption were not enough, Typhoon Yunya moved ashore at the same time with rain and high winds. The large anomalies seen in the Southern Hemisphere springtime high latitudes are presumably related to the depth and timing of the ozone hole in these 2 years relative to the — comparison period.
However, eruptions vary in style and intensity, so such a correspondence may not be feasible. No spam, we promise.