Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.g41a0789r&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #G41A-0789
Physics
[1204] Geodesy And Gravity / Control Surveys, [1217] Geodesy And Gravity / Time Variable Gravity, [1219] Geodesy And Gravity / Gravity Anomalies And Earth Structure, [1295] Geodesy And Gravity / Integrations Of Techniques
Scientific paper
The National Geodetic Survey has several million gravity data points collected over a 60 year time span. Some of these data points are located in geophysically active regions where the gravity field changes over time. In a region west of Mobile Bay, such a region was detected by airborne observations. In an effort to validate the airborne survey, a surface collection campaign was completed on a 10 km spacing over a region of 250 km by 150 km. Several absolute stations were set and relative gravity lines run across the region. Since the locations of the original could not be accurately located, a GPS-controlled survey was completed to develop a grid that spanned the same geographical region. Both grids were compared to ascertain the quality of the original data and validity of the airborne gravity. The region borders the Southern Louisiana Allochthon where a 30 year slumping event occurred. Gravity in the database pre-date the event and provide the pre-event gravity field. The newer data provide the post-event field. The difference between them is directly a function of the geophysical change over that span of time. While this span of time is significantly larger than has been addressed by GRACE modeling, the concept remains equally valid over events that occur over a much shorter period of time. Collection of a grid of gravity values develops a regional gravity field that may be compared to an earlier model to develop a gravity change field. Hence, this is a viable, if somewhat expensive, alternative to overflight by GRACE or a GRACE Follow-On mission.
Roman Daniel R.
Saleh J.
Winester Daniel
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