Wednesday, July 22, 2009

Natural disasters

Krakatau Volcano strikes causing tsunami
The ear deafening eruption began with a huge explosion which was heard 155 km away in Batavia. The ash column which rose in four hours was 36 km high. In the afternoon and evening the explosions became louder and more distinct throughout western Java.
Tremendous explosions recorded at 6:36 am, 9:58 am, 10:45 am. In Batavia the temperature inclined from 18 degrees to 27 degrees. During the morning 30 m high tsunamis hit the coasts of Java and Sumatra, killing 36,000 people. These were the most devastating effects of the eruption. At 12:30 pm a 2 m high tsunami hit Batavia.
The explosions were heard 4653 km away on the Island of Rodrigez in the Indian Ocean. A 2 m high wave was recorded in Auckland, 7767 km away. A bank of pumice floated to Durban, South Africa by September 1884, over a year after the eruption. Volcanic dust and gases reached the stratosphere and circled the world in two weeks. Beautiful sunsets were visible around the world. The old island of Krakatau was destroyed. The former volcanic cones of Perboewatan and Danan fell into a hole in the crust which flooded with sea water. Only the southern part of Rakata remained. Two-thirds of the original island was destroyed.
Two temporary islands were formed from pumice - Steers and Calmejer. They were eventually eroded by the waves.
information gathered from
http://www.volcanolive.com/