Analysis of gravity data in Central Valleys, Oaxaca, southern, Mexico

Abstract:

The region known as Central Valleys is located in the state of Oaxaca, southern, Mexico (16.3^o- 17.7 ^o N Lat. and 96 ^o - 97 ^o W Long.) In its central portion is settled the capital of the state. There are very few published detailed geological studies..

Geomorphological and geological features, indicates that Central Valleys and surrounding mountains conform a graben structure. Its shape is an inverted Y, centred on Oaxaca City.

The study area was covered by a detailed gravity survey with a homogenous distribution of stations. The Bouguer gravity map is dominated by a large gravity low, oriented NW-SE.

In order to know the characteristics of anomalies observed gravity, data transformations were used. The use of spectral methods has increased in recent years, especially for the estimation of the depth of the source. Analysis of the gravity data sheds light on the regional depth of the Graben basement and the spatial distribution of the volcanic rocks