Collaborative Research: An Asthenosphere-Lithosphere Probe In North America-An International Multi-Scale Seismic Experiment

9418718 盲文 1995 年，加拿大 Lithoprobe 计划计划建立一个大陆规模的主动源扩展地震剖面，以探测阿尔伯塔平原下方的太古代上地幔，探测器的中点位于梅迪辛哈特地块（一个自元古代以来一直处于高位的地壳块）。 这个 DeepProbe 剖面以卡尔加里附近为中心，沿西科迪勒拉山脉的前部和内部有一个 2500 公里的孔径。 加拿大人将向两个密集的接收区发射炮弹，每个接收区长约 600 公里，从卡尔加里向南延伸到美国科罗拉多州和怀俄明州边境。 该项目是美国 3 个综合地震实验的一部分，这些实验将补充加拿大的努力，利用类似的实验方法，但解决美国境内不同的构造和地质问题。 3个实验分别是：1）主动源扩展大孔径地幔探测器； 2) 被动远震记录和 3) 地壳折射剖面。 所检查的广泛尺度允许对完整的壳幔系统进行地球动力学评估。 美国的实验将研究科罗拉多高原/落基山脉南部显生宙地质构造作用改变的显生宙软流圈和太古代-元古代岩石圈。 ***

9418718 Braile In 1995 the Canadian Lithoprobe program plans a continental scale active source expanding spread seismic profile to probe the Archean upper mantle beneath the Alberta Plains, with the midpoint of the probe over the Medicine Hat Block, a crustal block which has been high standing since the Proterozoic. This DeepProbe profile, centered near Calgary, has a 2500km aperture along the front and interior of the western Cordillera. The Canadians will shoot into 2 dense receiver spreads, each roughly 600km long, extending from Calgary southward into the US to the Colorado-Wyoming border. This project is a component of a suite of 3 integrated US seismic experiments which will complement the Canadian effort, making use of similar experimental methodologies, but addressing different tectonic and geologic problems within the US. The 3 experiments are: 1) an active source expanding spread large- aperture mantle probe; 2) passive teleseismic recording and 3) a crustal refraction profile. The wide-range of scales examined permits geodynamic evaluation of a complete crust-mantle system. The US experiments will investigate Phanerozoic asthenosphere and Archean-Proterozoic lithosphere modified by Phanerozoic tectonism beneath the Colorado Plateau/Southern Rocky Mountains. ***