The quake off Sumatra happened at around 0800 local time, causing a giant rupture in the sea bed, which set a huge body of water moving at a speed of up to 700kph.
苏门答腊地震发生于当地时间约早上8点，造成海底巨大裂缝，引起大量的海水以高达700公里/小时的速度前进。
Therefore, the study of the rupture expansion speed is very important for the study of rupture expansion mechanism and it is of great significance in the controlled blasting of rock.
因此，研究裂纹扩展规律必须研究扩展速度，对探讨岩石断裂控制爆破机理，具有重要意义。
The result shows that the inclusion, high cooling speed and uneven of cooling speed after rolling are the main reasons for steel plate cold bending rupture.
结果表明， 钢板中有较多的非金属夹杂物及轧后冷却速度过快和冷速不均匀是导致冷弯性能不合格的主要原因。
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