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

小行星9418718 1995年，加拿大Lithoprobe计划在阿尔伯塔平原下建立一条大陆尺度的主动震源扩展地震剖面，探测中心位于梅迪辛哈特地块（Medicine Hat Block）之上，该地块自元古宙以来一直处于高位。 这个DeepProbe剖面以卡尔加里附近为中心，沿着西部科迪勒拉山脉的前部和内部有一个沿着2500公里的孔径。 加拿大人将向2个密集的接收器散布发射，每个散布约600公里长，从卡尔加里向南延伸到美国科罗拉多州和怀俄明州的边界。 该项目是一套由3个综合美国地震实验组成的组成部分，该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。 这3个实验是：1）主动源扩展扩展大孔径地幔探针，2）被动源扩展记录，3）地壳折射剖面。 所研究的尺度范围很广，可以对完整的壳幔系统进行地球动力学评价。 美国的实验将研究科罗拉多高原/南落基山脉下受中生代构造作用影响的中生代软流圈和太古宙-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. ***