Why do P waves arrive before S waves?
The direct P wave arrives first because its path is through the higher speed, dense rocks deeper in the earth. The PP (one bounce) and PPP (two bounces) waves travel more slowly than the direct P because they pass through shallower, lower velocity rocks. The different S waves arrive after the P waves.
In what three ways do P waves differ from S waves?
Difference between s waves and p waves
| P waves | S waves |
|---|---|
| The first wave to hit seismographs | Second waves to hit seismographs |
| They are compression waves | They are shear waves |
| Can move through solids and liquids | Can only move through solids |
How deep was the earthquake which struck Taiwan on December 1 2008?
The epicentre of the quake, which struck at 0316 GMT, was 31 km (19.2 miles) northeast of Chenggong on the east coast, at a depth of 30 km, the Central Weather Bureau said in a statement. Earthquakes occur frequently in Taiwan, which lies on a seismically active stretch of the Pacific basin.
What is the atomic bomb equivalent of energy released during a 7.0 quake USGS?
A magnitude 4.0 earthquake is only equivalent to about 6 tons of TNT explosives, but because the Richter scale is a base-10 logarithmic scale, the amount of energy released increases quickly: A magnitude 5.0 earthquake is about 200 tons of TNT, magnitude 6.0 is 6,270 tons, 7.0 is 199,000 tons, 8.0 is 6,270,000 tons.
What does a 7 earthquake feel like?
Intensity 7: Very strong — Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken. Intensity 6: Strong — Felt by all, many frightened.
What is the Max Richter scale?
In theory, the Richter scale has no upper limit, but, in practice, no earthquake has ever been registered on the scale above magnitude 8.6. (That was the Richter magnitude for the Chile earthquake of 1960. The moment magnitude for this event was measured at 9.5.).
How many tons of TNT is a nuke?
1,000,000 tons
How much damage can 1 kg of TNT do?
Under controlled conditions one kilogram of TNT can destroy (or even obliterate) a small vehicle. The approximate radiant heat energy released during 3-phase, 600 V, 100 kA arcing fault in a 0.5 m × 0.5 m × 0.5 m (20 in × 20 in × 20 in) compartment within a 1-second period.