My earth is vibrated

It makes thrilling and scary . Watch out the earthquakes!
So busy doing something suddenly we felt a foothold move. Our bodies swaying. Objects hanging swinging faster and faster. Well it's the earthquake.
Why does the earthquakes happen? We know an earthquake consists of 2 types, namely tectonic and volcanic earthquakes. Tectonic earthquake occurs when plates move on the earth's surface following the movements of the earth's core and the hot liquid. While volcanic earthquake is an earthquake that occurred since the outbreak of active volcanoes.
We should thank the inventor Charles Richter is a seismograph instruments that can measur e the power of the earthquake. This calculation is (skala richter) :
1 - 3,9 = The vibration has felt although it's not yet begun to damage
4 - 5.9 = The light, glass, and others are not fixed location will vibrate and silent rustle, not a strong building will collapse.
6 - 7 = The damage can occur around 160 km from the epicenter
8 - 8, 9 = It has damage power very high
9 = It happens once the 18 years but it can destroy an area without leaving any building

So far, there are tools that inibelum predict with certainty the coming of a quake. That's why earthquakes often take many lives. When an earthquake occurs, it is advisable not to panic. Our salvation depends of our alertness. This survival guide during the earthquake :
1. Immediately out of the building and look for the plain
2. If not possible refuge under a sturdy table
3. Avoid items fragile
4. if you was in the elevator, do not scream hysterically, because panic can use all of oxygen there
5. stop the vehicles
6. immediately turn off the electricity to avoid the earthquake