GY305 Geophysics Lab 3: Geomagnetics - University of South ...



GY305 Geophysics Lab 3: GeomagneticsProblem 1.Using the attached map of the North Atlantic magnetic anomalies calculate the following: At the Denmark Straights calculate the distance in kilometers from anomaly 24 on the North American plate across the mid-Atlantic ridge to the anomaly 24 on the Eurasian Plate:Note: Kilometers per longitude degree = 111.321 km * cos(Latitude deg.)Width (kilometers) =_______________________________Age of Anomaly 24 (see time chart) = ___________________________Degrees per inch from map grid = ______________________Kilometers per longitude degree at 60N latitude = _________________Kilometers per inch @ measurement point = __________________Full plate spreading rate at Denmark Straights = _____________________________________________? spreading rate at Denmark Straights = ______________________________Problem 2.Using the attached map of the East Pacific magnetic anomalies calculate the following: At the east Pacific rise ridge between the Clipperton and Galapagos fracture zones calculate the distance in kilometers from the ridge to anomaly 17 Pacific plate. Width (kilometers) =_______________________________Age of Anomaly 17 (see time chart) = ___________________________Degrees per inch from map grid = __________________Kilometers per longitude degree at 3N latitude = _________________Kilometers per inch @ measurement point = ______________1/2 plate spreading rate = _____________________________________________Full spreading rate = ______________Problem 3.Using equations presented in class design an Excel spreadsheet that will calculate the paleo-latitude of the original position of rocks containing remnant magnetism. The spreadsheet must also calculate the paleo-pole latitude & longitude given the:Sample present day latitude & longitude (X , X ): 60N, 90WPresent day inclination of remnant magnetism (I): 37The present day magnetic declination of the remnant field (D): -70Design the spreadsheet for the above input, and then produce a printout and a file to turn in:Original latitude of the rock ():______Latitude & Longitude of the paleo-magnetic pole (P , P ):______, _______ ................
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