working on 制力于

They hope to develop an early warning system that can be used to forecast earthquakes so that lives can be saved.----that 引导定语从句修warning system ; so that 引导目的状语从句

be involved in 积极的参与。。。。

These networks are on the alert for warning signs that show the weakening of rock layers that and precede an earthquake .---on the alert 处于警戒状态；wwarning signs that........an earthquake ,由that 引导的定语从句，第一个that 修饰warning signs,第二个that修饰rock layers(岩石层)

speculate 推测

the amount of 一定量。。。

to prove 去证实

be associated with 与。。。有联系

While this is a small start ,it is still a beginning.---while在本句中做连词，引导让步状语从句（意思，尽管/）虽然