地震的起因中英文介紹
導語:地震又稱地動、地振動，是地殼快速釋放能量過程中造成振動，期間會產生地震波的一種自然現象。地球上板塊與板塊之間相互擠壓碰撞，造成板塊邊沿及板塊內部產生錯動和破裂，是引起地面震動(即地震)的主要原因.
地震的起因英文介紹
The causes of the earthquake 地震的起因
The earthquake causes the Earth's surface vibration There are many reasons according to the causes of earthquakes, earthquakes can be divided into the following:
引起地球表層振動的原因很多，根據地震的成因，可以把地震分爲以下幾種：
1. Tectonic earthquake
Since the depths of underground rock dislocation, caused by the rupture of the earthquake known as tectonic earthquake. Such earthquake occurred most often, the greatest damage, the earthquake accounted for about 90 percent of the world over.
1.構造地震
由於地下深處岩層錯動、破裂所造成的地震稱爲構造地震。這類地震發生的次數最多，破壞力也最大，約佔全世界地震的90%以上。
2. Volcanic earthquake
As the volcano, such as magmatic activity, such as gas explosions caused by the earthquake known as the volcanic earthquake. Only in areas of volcanic activity may occur before the volcanic earthquakes, such earthquakes around the world accounts for only about 7 percent of the earthquake.
2.火山地震
由於火山作用，如岩漿活動、氣體爆炸等引起的地震稱爲火山地震。只有在火山活動區纔可能發生火山地震，這類地震只佔全世界地震的7%左右。
3. Earthquake collapse
As the top of underground caves or mine collapse caused by the earthquake known as the collapse of the earthquake. Such relatively small-scale earthquake, the number of little, if any, tend to occur in the limestone cave over the region or large-scale underground mining of the mining area.
3.塌陷地震
由於地下巖洞或礦井頂部塌陷而引起的地震稱爲塌陷地震。這類地震的規模比較小，次數也很少，即使有，也往往發生在溶洞密佈的石灰岩地區或大規模地下開採的礦區。
4. Induced earthquake
As water, oil field activities such as water flooding caused by the earthquake known as the earthquake-induced. Such earthquake only in certain oil reservoir area or region.
4.誘發地震
由於水庫蓄水、油田注水等活動而引發的地震稱爲誘發地震。這類地震僅僅在某些特定的水庫庫區或油田地區發生。
5. Artificial earthquake
Underground nuclear explosions, explosives, blasting and other human-induced ground vibration known as the artificial earthquake. Artificial earthquake was caused by human activities in the earthquake. Such as industrial blasting, the vibration caused by underground nuclear explosions in deep water in a high-pressure water and the large increases the pressure on the crust, sometimes induced earthquake.
The seismic wave origin, called the source. Source on the ground of the vertical projection, called the epicentre. The depth of the epicentre to the source called focal depth. Usually focal depth of less than 70 km of the quake is shallow, deep in the 70-300 km is in the earthquake, and the depth is greater than 300 kilometres of deep earthquakes. Devastating earthquake is generally shallow earthquake, such as the Tangshan earthquake in 1976 the focal depth of 12 km.
5.人工地震
地下核爆炸、炸藥爆破等人爲引起的地面振動稱爲人工地震。 人工地震是由人爲活動引起的地震。如工業爆破、地下核爆炸造成的振動;在深井中進行高壓注水以及大水庫蓄水後增加了地殼的壓力，有時也會誘發地震。
地震波發源的地方，叫作震源。震源在地面上的垂直投影，叫作震中。震中到震源的深度叫作震源深度。通常將震源深度小於70公里的叫淺源地震，深度在70-300公里的叫中源地震，深度大於300公里的叫深源地震。破壞性地震一般是淺源地震。如1976年的唐山地震的震源深度爲12公里。
