By Shloka. What are Earthquakes and why do they occur? Earthquakes are when two plate boundaries meet. It is either caused by friction, It usually is.

EarthquakesBy Shloka

What are Earthquakes and why do they occur?Earthquakes are when two plate

boundaries meet.It is either caused by friction,It usually is most strongest at the

heart of the city.It is measured on the Richter scale and

the number before is one hundred times more greater than the one before.

Why do they occur?They happen when there is a very sudden

movement between two plate boundaries.It happens when plates are sliding, colliding

or parting from each other.Examples are San Andreas Fault in

California.

San Francisco Earthquake.The San Francisco earthquake hit with hard

impact as it caused fires which raged through the city.

It measured 6.9 on the Richter scale and it killed more than 63 people and injured more than 4000 people.

People were also killed by falling landslides and broken buildings.

It left 5000 homeless.

Impact of the San Francisco earthquake.In October 1989 the Pacific plate suddenly moved

so vigorously past the north of the San Andreas Fault.

The Earthquake’s impact was mostly felt in Santa Cruz mountains just south of San Francisco.

Mainly the people were killed by fires which were started by gas explosions and wooden houses spread it more.

Businesses lost lots of money and there were disruption on roads as well because of all the destruction as people tried to flee from the half destroyed cities.