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| This lake formed in 1994 behind a blockage created chiefly by lahar deposits in the Pasig-Portrero River about 12 km from Mount Pinatubo in the Philippines, though some secondary pyroclastic flows may have contributed (the river flows right to left). After a moderate rainfall, the lake broke out on the night of 22 September 1994. A sudden surge of water swept downstream, increasing in size as the rushing water eroded sediment from previous lahar deposits. Approximately 25 people were killed by the lake breakout, mostly in a community located about 15 km downstream. |
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