According to a study by the China Earthquake Administration (CEA), the earthquake occurred along the Longmenshan fault, a thrust structure along the border of the Indo-Australian Plate and Eurasian Plate. Seismic activities concentrated on its mid-fracture (known as Yingxiu-Beichuan fracture). The rupture lasted close to 120 sec, with the majority of energy released in the first 80 sec. Starting from Wenchuan, the rupture propagated at an average speed of 3.1 kilometers per second 49° toward north east, rupturing a total of about 300 km. Maximum displacement amounted to 9 meters. The focus was deeper than 10 km. COUNT 8
QSN1 On what fault did the earthquake occur? ANS1 Longmenshan fault QSN2 Where is the Longmenshan fault located? ANS2 along the border of the Indo-Australian Plate and Eurasian Plate QSN3 How long did the rupture last? ANS3 120 sec QSN4 How deep was the focus of the earthquake? ANS4 10 km QSN5 Along what fault line did the quake happen? ANS5 Longmenshan fault QSN6 On which fracture did the quake focus? ANS6 Yingxiu-Beichuan fracture QSN7 When wasmost of the energy released during the initial eruption? ANS7 first 80 sec. QSN8 What was the most displacement caused by the earthquake? ANS8 9 meters