Gulf of Mexico Hydrates

Gulf of Mexico Hydrates (2011)

 

PIs:

Peter Gerstoft (SIO) 

 

 

 

 

 

 

 

 

Gulf of Mexico, MC118 April 2011 experiment. Acoustic source position during south-to-north active survey. 

Experiment Summary

(Taken from Carriere and Gerstoft, doi: 10.1190/GEO2012-0241.1):  

The study and monitoring of complex natural marine hydrates require long-term or periodic data collection. For this purpose, data collected from long-term deployment of ocean-bottom seism- ometers (OBS) can be used for detecting and monitoring changes in hydrate distribution and other hydrocarbon related subsurface process. In this paper, empirical Green’s functions are extracted from crosscorrelated signals collected over a 2D transect of OBS. Results are used to estimate seismic reflectivity of the shallow subsurface.

Data were acquired at Woolsey Mound, a very active carbonate/ hydrates structure in Mississippi Canyon Lease Block 118 (MC118), Northern Gulf of Mexico, used as seafloor observatory by the Hydrates Research Consortium for more than a decade (McGee et al., 2009). The mound is about 1 km in diameter and located in nearly 900-m water depth. Recent study of the mound subsurface integrating several seismic data sets at different resolutions (backscatter, autonomous underwater vehicle [AUV], and shallow source/deep receiver [SSDR] surveys) has shown that the mound is formed by crestal normal faults nucleating at the top of a diapir- shaped salt body present in the shallow subsurface (Macelloni et al., 2012). The OBS transect used here crosses one of the main normal faults of the mound. 

Cruises

4/3/2011 - 4/8/2011

15 WHOI instruments were deployed and recovered a few days later along the Woolsey Mound site.

Data

Data from all instruments deployed are archived under temporary network code XJ and assembled data set ID #11-018 at the IRIS DMC.