Category Archives: Gravity Anomalies

Late Cretaceous Orogenic North American Continental Margin

A huge problem with geological maps is that their daunting psychedelic maze of colors makes it very difficult to bear down on specific features. We recently discovered a GIS series of State scale maps from USGS  where it is possible to … Continue reading

Posted in Geography, Geology, Gravity Anomalies, Paleogeography, Plate Tectonics | Tagged , , | 1 Comment

Gravity Signals of Extensional Sialic Crustal Regimes

I have always loved the poorly named Great Basin of the Western United States. Yes, its maze of lowlands held a lot of glacial meltwater during the last glacial maximum before letting it percolate out to the Columbia and the Sea … Continue reading

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The Hawaiian/Emperor Seamounts and How Island Arcs are Formed

Ever wonder why offshore island arcs should form at random spots in the oceans? No? Don’t worry, its a far fig newton. We offer here the suggestion that the locations are not random, that island arc trenches and probably spreading ridges and … Continue reading

Posted in Geography, Geology, Gravity Anomalies, Seamount Chains as Incipient Island Arcs | Tagged , , , | 1 Comment

Granite Rafts

Continents are granite rafts. We believe that granite is formed when thoroughly hydrated ocean floor sinks at a subduction zone or trench, often at the edge of a continent. When it sinks deep enough it gets cooked at very high … Continue reading

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Hawaii

By incredibly good luck I’ve been spending lots of time in Hawaii lately, on business no less. I stay in this unbelievable house.   One really gets the sense of being out in the middle of the ocean in Hawaii, … Continue reading

Posted in Geography, Geoid, Geology, Gravity Anomalies, Oceanography, Plate Tectonics | Tagged , , , | 1 Comment

California Great Central Valley as a Cretaceous Sea of Cortez

I was travelling the world as I often do in Google Earth, pondering how strange it is that the Hawaiian Seamount chain created a gravity low its entire length, when I noticed this: Probably just because gravity lows are a nice deep … Continue reading

Posted in Geography, Geology, Gravity Anomalies, Paleogeography, Plate Tectonics | Tagged , , , , , , | 4 Comments

Bad Hair Days and Magnetic Excursions

This picture of a model simulating the weakened and divided magnetic field during a reversal should be in the thesaurus when you look up “bad hair day”. If this is anywhere near correct it should be no surprise that the nano … Continue reading

Posted in Gravity Anomalies, Magnetic Reversals, True Polar Wander, Virtual Geomagnetic Pole (VGP) | Tagged , , , | Leave a comment