SEISMOLOGICAL REPORTS FOR FEBRUARY, 1916

Seismological aspects of the Guatemala Earthquake of February 4, 1976

Detailed analyses of teleseismic surface waves and body waves from the Guatemala e rthquake of February 4, 1976, show the following: (1) Left lateral displacement along a vertical fault with a strike varying from N66øE to N98øE is consistent with the teleseismic data. (2) The seismic moment was 2.6 X 102? dyn cm. The directivity ofthe surface wave radiation i dicates an asymmetric (1:2.3) bilat...

Global Tectonic Regionalization for Seismological Data Analysis

A global tectonic regionalization, GTR1, has been constructed for use in seismological studies of aspherical heterogeneity. Three oceanic regions are defined by equal increments in the square root of crustal age (25and lO0-m.y. isochrons), and three continental regions are distinguished according to their generalized tectonic behavior during the Phanerozoic (Precambrian shields and platforms, P...

Seismological Constraints upon Mantle Composition

T32B-03, pp. WP193–WP194. Birch F. (1952) Elasticity and constitution of the Earth’s interior. J. Geophys. Res. 57, 227–286. Brodholt J. P. (2000) Pressure-induced changes in the compression mechanism of aluminous perovskite in the Earth’s mantle. Nature 407, 620–622. Castle J. C. and Creager K. C. (1999) A steeply dipping discontinuity in the lower mantle beneath Izu-Bonin. J. Geophys. Res. 10...

Francis Crick 1916–2004

In March 1953, 31 years after Howard Carter’s astonishing first glimpse into Tutankhamun's tomb, an even more golden treasure was found. Francis Crick and Jim Watson shared that moment of discovery as they looked, for the first time, into the heart of all living things. They saw the structure of DNA, and their vision became the big bang of modern biology. Francis’ life in research began inauspi...

Frederick M. Allen, 1916