Strange natural phenomena
Soil erosion combined with intense earthquake damaged many important routes. One path is silt. A road damaged by the impact from the earthquake. A strong earthquake of 7.8 magnitude occurred today in the region South Island, New Zealand, causing a tsunami. Grandparents Chris and Viv Young watched a road destroyed by an earthquake near the town of Ward.
In broad terms, it refers to an earthquake shook the ground. They are caused by several reasons:
Endogenous: Due to tectonic movement of tectonic plates in the Earth’s crust, resulting in an active fault and / or a volcanic eruption in the subduction zone. See also: Structure of the Earth.
Exogenous: Meteorites collide into the Earth, the rock landslides in large quantities.
Human: human activity including vibration caused unintentional, or intentional incitement in the survey or in mining or construction, especially the nuclear tests underground.
In the conventional view, it is understood that the earthquake shook strong enough in an area large enough, as many people feel that leaving traces or cracked land destroyed in that area. Physically, the shaking amplitude which must be large enough, may exceed the elastic limit of the terrestrial environment and cause cracks. It earthquake with naturally derived, or extended to the nuclear test. Note that the seismographs at seismological observation stations are designed to recognize the form of such earthquakes, and filter out vibrations due to human causes.
Endogenous natural causes related to the movement of the Earth’s layers and blocks. But slowly, the crust and in the Earth is always moving. When higher stress physical endurance Earth then the fault occurs, releasing energy and earthquakes.
Most natural seismic events occur at the boundaries of tectonic plates is the part of Earth’s lithosphere. The researchers used data on the earthquake location to find out what this boundary. It leads to classification:
The earthquake occurred at the boundary is called trans-disc earthquake
The earthquake occurred in a disk (more rarely) called the earthquake in the disk.