Rabaul erupted in 1994 in Papua New Guinea.
Ash thickness1 in mm |
Estimated load2 in kPa |
Observed damage to roofs |
<100 | 1.5 - 2.0 | Roofs and guttering generally remained intact. |
<200 | 3.0 - 4.0 | 80-90% of roofs remained intact with little apparent damage. Sagging or partial collapse occurred in some buildings. |
<300 | 4.5 - 6.0 | More than 50% of roofs did not collapse. |
500-600 | 7.5 - 12.0 | More than 50% of roofs collapsed. |
>600 | 9.0 - 12.0 | It is doubtful that buildings survived without significant damage even when the roof remained relatively intact. |
1Ash
fell wet 2Using this equation and assuming ash density of 1,500 to 2,000 kg/m3 Data from Blong and McKee, 1995. |
The 1994 eruption of Rabaul devastated much of the town of Rabaul, with ash deposits as thick as 2 m. The power supply was shut down at the start of the eruption but large sections of the electrical distribution system were damaged by falling-trees and buildings.