Earthquakes often come together with volcanic eruption. In late 1084,strong earthquarkes began shaking in the nevado in the del ruiz volcano in columbia eveyday. On november 14,1985 , it erupted . A nearby river became a sea of mud that buries four towns.the disaster killed mor than 2100 people .mexico city has frequent earthquarkes. However ,newer buliding there are built to be safe in earthquarkes.therefore,when an earthquarkes measuring 7.1 on the ricther scale hit northem california on october 17,1989,only 67 people were kiled.
The earthquarkes hit in the afternoon ,when thousands of people were driving home from work .freeway and bridge broke and fell .buried under the layers of The oakland freeway ,people were crushed in their flattened cars.explosions souded like thunder as older building seemed to brust apart along with The freeway .as eletric power lines broke from the falling bridge ang building , The sky ,covered with hug clouds of black dust ,appeared to be filled with lightning. Water rushed into the streets from broken pipes and mixed gas from broken gas lines ,causing more explosions