Gravity and Magnetic Methods

Presented By:

Josh Beckwith

Alison Dorsey

Janina Stampahar

Paul Schwering

GPH 492/692 FINAL PROJECT

California Wash & Astor Pass,Nevada

Gravity Data Acquisition• Survey control established with precision

theodolite measurements

• Gravity measured with precision L&R g-meter

Magnetic Data Acquisition• Utilized two Scintrex precision

magnetometers, one stationary base unit, one roving unit

• Survey control established with hand-held Garmin GPS unit

Survey AreasSurvey Areas

CaliforniaCaliforniaWashWash

Astor PassAstor Pass

California Wash

Survey AreaTo LasVegas

CALIFORNIA

WASH

CALIFORNIA

WASH

Gravity Profile

Easting (m)

CALIFORNIA

WASH

65 65

S=0.0005

S=0.0002

Astor PassAstor Pass

‘

116°C

550 m

Tufa Tower

93°C

94°C 87°C

79°C

90°C

1 km

The Needles

Astor Pass

Tufa Tower

Aerial Views Face ~E

W E

N

Regional Geology Map w/ Gravity Contours(from Dr. Jim Faulds)

Survey AreaSurvey Area

Astor Pass Magnetic Data

Astor Pass Magnetic Data

Astor Pass Gravity Data

Astor Pass Gravity Data

Northing (m)

ASTOR

PASS

70 7080 85

QUESTIONS?