Description and significance of the gravity field in the Reelfoot Lake region of northwest Tennessee

Technical Report · Sun Apr 01 04:00:00 EST 1984

OSTI ID:7132259

Stearns, R G; Towe, S K; Hagee, V L; Nava, S J; Wilson, S L

Gravity surveys at various levels of detail have been made at approximately 1200 stations in the Reelfoot Lake region of northwest Tennessee and adjacent portions of Missouri and Arkansas. Individual features were surveyed in detail. At Reelfoot Scarp, six lines of stations having a 100 to 500 foot spacing with close elevation control (+0.1 foot) were measured. Anomalies on these lines are caused by near-surface geology (faulting, clay-filled channel of abandoned course of Mississippi River). A survey of less accuracy discovered an anomaly along a fault at Henning in the Ripley South Quadrangle. In the Reelfoot Lake region the area of abundant earthquake occurrence is related to the gravity anomaly pattern. The earthquake area is sharply limited on the south by an abrupt change in anomaly trends, and the earthquakes diminish in number at a similar change in trend to the north. Some positive gravity anomalies appear to mark plutons where they coincide with positive magnetic anomalies. 13 references, 21 figures, 1 table.

• Research Organization: Vanderbilt Univ., Nashville, TN (USA)
• OSTI ID: 7132259
• Report Number(s): NUREG/CR-3769; ON: DE84901184
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
DATA
EARTHQUAKES
EXPERIMENTAL DATA
FEDERAL REGION IV
GEOLOGIC FAULTS
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
GRAVITY SURVEYS
INFORMATION
MISSISSIPPI RIVER
NORTH AMERICA
NUMERICAL DATA
RIVERS
SEISMIC EVENTS
STREAMS
SURFACE WATERS
SURVEYS
TENNESSEE
USA