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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A144 (1964)

First Page: 90

Last Page: 121

Book Title: M 3: Marine Geology of the Gulf of California

Article/Chapter: Seismic Refraction Studies in Gulf of California

Subject Group: Sedimentology

Spec. Pub. Type: Memoir

Pub. Year: 1964

Author(s): Richard P. Phillips (2)

Abstract:

During April and May of 1959, 26 seismic refraction stations were completed in the Gulf of California. In the shallow Northern Gulf province the crust of the earth consists of four layers--1.5 km of unconsolidated sediments with a Previous HitvelocityNext Hit of 2.1 km/sec, 2.0 km of semiconsolidated sediments with a Previous HitvelocityNext Hit of 4.1 km/sec, 4.3 km of basement material with a Previous HitvelocityNext Hit of 5.4 km/sec, and a main crustal layer with a Previous HitvelocityNext Hit of 6.7 km/sec. The total thickness of the crust is not well determined but appears to be about 25 km. In the central and southern sections of the Gulf only two layers can be resolved--a 1.3 km layer of unconsolidated material, and 6.2 km of material with a Previous HitvelocityNext Hit of 5.8 km/sec. The subcrustal material has an average Previous HitvelocityNext Hit of 7.8 km/sec and lies at a de th of 9.3 km. South of the Gulf proper the crust can be resolved into three layers--0.4 km of unconsolidated sediments, a 1.3 km layer with an average Previous HitvelocityNext Hit of 5.5 km/sec, and a 4.3 km third layer with an average Previous HitvelocityNext Hit of 6.7 km/sec. The upper mantle lies at an average Previous HitdepthNext Hit of 8.9 km, and has a Previous HitvelocityTop of 7.7 km/sec. It is concluded that the northern portion of the Gulf of California has a structure similar to the continental borderland off Southern California, and that the southern section has a structure similar to the East Pacific Rise.

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