英語資源頻道為大家整理的4.20雅安地震英文報(bào)道：四川為何地震多發(fā)，供大家參考!
Find a map of China, Sichuan Province generally have a look the structure. The western mountainous area, the basin is among -- this is probably our most direct impression of this "the land of abundance". The view of back to Sichuan has been greatly small earthquake, if the location of the epicenter of the projection on the map, can generally be found -- location of these earthquakes, generally in the western mountains, and seems to border line parallel to the mountain - basin and linear distribution. As for the central basin, although the impact will be by the earthquake, but rarely is the epicenter region directly.
Sichuan topographic map, map the darker the color represents the higher altitude
After such a simple diagram steps, the first step in corollary: Sichuan earthquake, and its western the row of the basin "hill" has a correlation. This inference from experience, although simple, but in fact, has caught the essence of the problem. Because of the commonly known as a "mountain" terrain, is the Longmen Mountain Fault famous -- it is a through the lithosphere giant crustal fault system, the North-South extension is 500 kilometers, 70 kilometers wide at. Originally, the hard crust rock consisting of almost be secure against assault, it was broken, so large distortions, there must be something powerful tear it. So, we study the Longmen Mountain Fault Zone in scientists rock stress field is found, this powerful stress really exists, and it is from the southwest, the higher order -- the Qinghai-Tibet Plateau region.
Stress field analysis shows that the compressive stress from the Tibetan Plateau, then, why the Tibetan Plateau to provide stress so big field, it continuously oppress the eastern edge of the Sichuan Basin, so that the formation of fault system in such a big striker? Originally, the Tibetan Plateau is not the fundamental reason, it still is a result, is the India plate to Eurasia plate collision results. The collision between the mainland and the mainland than between the continent and ocean, the latter, a light in a sink, the ocean into the mainland, forming a trench and volcano arc (such as Japanese island). While the mainland has been floating in the ocean crust over millions of years, never disappeared, the same density, who doesn't let. Between the continental plate collided head-on, cut off the matter, then, these substances only heap on the ground, pile of a huge mound, in our view, is the great unprecedented high terrain -- Himalaya mountains and the Tibetan Plateau.
Earthquakes in the Longmen Shan fault zone, is from the Tibetan plateau stress field provides continuous extrusion to crustal stress in the earth's crust, when the rock is unbearable stress burden and the broken, broken, enormous energy release, in the form of mechanical wave spread around, they constitute a devastating earthquake. Longmen mountain is a mountain and basin two geological body contact with, because of the rigid object, the default of the force acting on the boundary between the two edges, therefore, mountain and basin in contact with the striker, will become the region of stress concentration field release of its mechanical force, in this area, and the earthquakes up.
Find a map of China, Sichuan Province generally have a look the structure. The western mountainous area, the basin is among -- this is probably our most direct impression of this "the land of abundance". The view of back to Sichuan has been greatly small earthquake, if the location of the epicenter of the projection on the map, can generally be found -- location of these earthquakes, generally in the western mountains, and seems to border line parallel to the mountain - basin and linear distribution. As for the central basin, although the impact will be by the earthquake, but rarely is the epicenter region directly.
Sichuan topographic map, map the darker the color represents the higher altitude
After such a simple diagram steps, the first step in corollary: Sichuan earthquake, and its western the row of the basin "hill" has a correlation. This inference from experience, although simple, but in fact, has caught the essence of the problem. Because of the commonly known as a "mountain" terrain, is the Longmen Mountain Fault famous -- it is a through the lithosphere giant crustal fault system, the North-South extension is 500 kilometers, 70 kilometers wide at. Originally, the hard crust rock consisting of almost be secure against assault, it was broken, so large distortions, there must be something powerful tear it. So, we study the Longmen Mountain Fault Zone in scientists rock stress field is found, this powerful stress really exists, and it is from the southwest, the higher order -- the Qinghai-Tibet Plateau region.
Stress field analysis shows that the compressive stress from the Tibetan Plateau, then, why the Tibetan Plateau to provide stress so big field, it continuously oppress the eastern edge of the Sichuan Basin, so that the formation of fault system in such a big striker? Originally, the Tibetan Plateau is not the fundamental reason, it still is a result, is the India plate to Eurasia plate collision results. The collision between the mainland and the mainland than between the continent and ocean, the latter, a light in a sink, the ocean into the mainland, forming a trench and volcano arc (such as Japanese island). While the mainland has been floating in the ocean crust over millions of years, never disappeared, the same density, who doesn't let. Between the continental plate collided head-on, cut off the matter, then, these substances only heap on the ground, pile of a huge mound, in our view, is the great unprecedented high terrain -- Himalaya mountains and the Tibetan Plateau.
Earthquakes in the Longmen Shan fault zone, is from the Tibetan plateau stress field provides continuous extrusion to crustal stress in the earth's crust, when the rock is unbearable stress burden and the broken, broken, enormous energy release, in the form of mechanical wave spread around, they constitute a devastating earthquake. Longmen mountain is a mountain and basin two geological body contact with, because of the rigid object, the default of the force acting on the boundary between the two edges, therefore, mountain and basin in contact with the striker, will become the region of stress concentration field release of its mechanical force, in this area, and the earthquakes up.