By Mary Jones
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Extra resources for Cambridge International A As-level Biology: Revision Guide
They accepted help from the Indonesian government and international aid groups. The cooperation led to a peace agreement in August 2005. apart. Often unsuspecting people return to the water’s edge after the first wave hits, only to be caught off-guard and washed away by the next. Tsunami-Ready Just three months after the December 2004 disaster, another strong earthquake struck. It tore at the same underwater fault near Sumatra. This time, the results were much different. The quake occurred under shallower water.
ON SOLID GROUND The ground a structure is built on has a lot to do with how well it can handle an earthquake. If it is anchored in solid ground or rock, it has a better chance of surviving a major shock. Many cities, though, have grown up on unstable ground. Often loose dirt and rock called landfill are hauled in and dumped to create a building site. Sometimes developers create land by pouring rock, sand, and dirt into water to increase the building area. This usually presents few problems—as long as the earth remains still.
They need to be flexible enough to sway a little. At the same time, they need to be stiff enough so that they do not whip violently back and forth. Changes made at Los Angeles City Hall include several engineering advancements. Built in 1928, the building was badly damaged in the 1994 Northridge earthquake. Afterward, the building was strengthened with steel braces and bars. These helped reinforce the building’s stone walls and central tower. Engineers also dug down and put a suspension system beneath the building.
Cambridge International A As-level Biology: Revision Guide by Mary Jones