Toward Nanoseismology

走向纳米地震学

• 批准号: 0126217
• 负责人: Raymond Jeanloz
• 金额: $ 30.21万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0126217&HistoricalAwards=false
• 关键词: Toward; Nanoseismology

Raymond JeanlozEAR-0126217The occurrence of deep-focus earthquakes remains one of the great mysteries of geophysics because laboratory experiments demonstrate that materials become ductile at the pressures of the Earth's deep interior. How then can rock undergo brittle rupture at the pressures of the deepest earthquakes, some 0.25 million atmospheres? The proposal requests support for a 3-year effort intended to develop and then begin applying a new experimental method for characterizing acoustic emissions generated from samples at high pressures. An array of GHz-frequency sensors is to be attached to a diamond-anvil cell in order to characterize the elastic-energy released by high-pressure phase transitions in mantle minerals and their analogs. The work combines proven technologies (acoustic-emission recording and GHz ultrasonics with the diamond cell), and shows considerable promise for future development of a large variety of complementary methods (optical, spectroscopic, diffraction) for characterizing brittle failure in detail and under a wide range of conditions.

深源地震的发生仍然是地球物理学最大的谜团之一，因为实验室实验表明，在地球内部深处的压力下，材料会变得具有延展性。 那么，岩石在最深的地震（大约25万个大气压）的压力下是如何发生脆性断裂的呢？ 该提案要求支持一项为期3年的工作，旨在开发并随后开始应用一种新的实验方法，用于表征样品在高压下产生的声发射。 将GHz频率传感器阵列连接到金刚石砧室，以表征地幔矿物及其类似物中高压相变释放的弹性能量。这项工作结合了成熟的技术（声发射记录和GHz超声波与金刚石细胞），并显示出相当大的前景，为未来发展的大量各种互补的方法（光学，光谱，衍射），详细和广泛的条件下表征脆性破坏。