A new vertical seismograph

New Vertical Geodesy

Vertical geodesy is undergoing a revolution because of two factors. First, new precise three-dimensional position measurement techniques used over very long distances and based on extraterrestrial reference systems provide a new class and precision of geometric data previously unavailable for geophysical investigations. Second, physical models in tectonic theory for large earthquakes predict cr...

Automatic classification of seismic events within a regional seismograph network

The Lunar Surface Gravimeter as a Lunar Seismograph

Vertical Orientation in a New Gobioid Fish from New Britain

WHILE VISITING Rabaul, New Britain, during Cruise 6 of the Stanford University vessel "Te Vega" we observed and collected specimens of a small gobioid fish that swam and hovered vertically, with its head up, in midwater close to pockets in the wall of an underwater cliff at depths below 30 feet. Many kinds of fishes, for example scorpaenids and cottoids, are known to orient vertically in contac...

The Earss Digital Seismograph : System Description and Field Trials

An earthquake detection and recording system known as EARSS has been developed for permanent seismograph stations and temporary field installations. It records three components of ground motion with a dynamic range of 120 dB. A frequency-domain algorithm detects earthquakes and initiates the recording of data on magnetic tape. Alternatively, EARSS can record data continuously, for preselected p...