Posthumous Paper by Gene Shoemaker Details Evidence of Comet Shower That Pummeled Earth 36 Million Years Ago

Geochemical evidence from a rock quarry in northern Italy indicates that a shower of comets hit Earth about 36 million years ago.

Geophysicists model the Cretaceous motions of Australia

The theory of plate tectonics says that Earth's crust has moved horizontally by thousands of miles over millions of years. For visual evidence, one need look no further than a map showing how nicely South America and Africa fit together.

Don Anderson Will Be Awarded the 1998 Crafoord Prize

The Royal Swedish Academy of Sciences is to award the 1998 Crafoord Prize in geosciences, with special emphasis upon "the dynamics of the deeper parts of the Earth," to Don L. Anderson of the California Institute of Technology and to Adam M. Dziewonski from Harvard University for their fundamental contributions to our knowledge of the structures and processes in Earth's interior.

Geologists find more evidence for an active fault beneath downtown and east Los Angeles

Geologists report new evidence for a fault beneath Los Angeles that could cause damaging earthquakes in the future.

Yucca Mountain Is Possibly More Seismically Active Than Once Believed, Geologists Discover

Recent geodetic measurements using Global Positioning System (GPS) satellites show that the Yucca Mountain area in southern Nevada is straining roughly 10 to 100 times faster than expected on the basis of the geologic history of the area. And for the moment at least, geologists are at a loss to explain the anomaly.

Mars Global Surveyor already bringing in scientific payoff

Despite a 12-month delay in aerobraking into a circular orbit, the Mars Global Surveyor is already returning a wealth of data about the atmosphere and surface of the Red Planet.

Biological Activity the Likely Culprit of Atmospheric Nitrous Oxide Increases

New research suggests that the changing concentration of nitrous oxide in the atmosphere is largely a result of biological activity.

Geophysicists Develop Model to Describe Huge Gravity Anomaly of Hudson Bay Region

Using a new approach to analyzing planetary gravity fields, two geophysicists, Mark Simons at the California Institute of Technology and Bradford Hager at M.I.T., have shown that incomplete glacial rebound can account for a substantial portion of the Hudson Bay gravity anomaly. Geophysicists Develop Model to Describe Huge Gravity Anomaly of Hudson Bay Region December 1997 97

Caltech Scientists Find Evidence For Massive Ice Age When Earth Was 2.4 billion Years Old

PASADENA— Those who think the winter of '97 was rough should be relieved that they weren't around 2.2 billion years ago. Scientists have discovered evidence for an ice age at the time that was severe enough to partially freeze over the equator. In today's new issue of Nature, California Institute of Technology geologists Dave Evans and Joseph Kirschvink report evidence that glaciers came within a few degrees of the equator's latitude when the planet was about 2.4 billion years old.

State-of-the-Art Seismic Network Gets First Trial-by-Fire During This Morning's 5.4-magnitude Earthquake

PASADENA—Los Angeles reporters and camera crews responding to a 5.4-magnitude earthquake this morning got their first look at the new Caltech/USGS earthquake monitoring system.

The look was not only new but almost instantaneous. Within 15 minutes of the earthquake, Caltech seismologists had already printed out a full-color poster-sized map of the region to show on live TV, and had already posted the contour map on the Internet. Moreover, they were able to determine the magnitude of the event within five minutes — a tremendous improvement over the time it once took to confirm data.

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