Publications
Filter Total Items: 3146
Groundwater flow and mass-movement dynamics, [abs.] Groundwater flow and mass-movement dynamics, [abs.]
No abstract available.
Authors
R.M. Iverson
Pliocene volcanic rocks of the Coso Range, Inyo County, California Pliocene volcanic rocks of the Coso Range, Inyo County, California
No abstract available.
Authors
Steven W. Novak, Charles R. Bacon
Lithic breccia and ignimbrite erupted during the collapse of Crater Lake Caldera, Oregon Lithic breccia and ignimbrite erupted during the collapse of Crater Lake Caldera, Oregon
The climactic eruption of Mount Mazama (6845 y.B.P.) vented a total of ∼50 km3 of compositionally zoned rhyodacitic to basaltic magma from: (a) a single vent as a Plinian pumice fall deposit and the overlying Wineglass Welded Tuff, and (b) ring vents as ignimbrite and coignimbrite lithic breccia accompanying the collapse of Crater Lake caldera. New field and grain-size data for the ring...
Authors
T. H. Druitt, C. R. Bacon
Long Valley is quiet but still bulging Long Valley is quiet but still bulging
No abstract available.
Authors
R. A. Kerr
Signs of a northeastern earthquake? Signs of a northeastern earthquake?
No abstract available.
Authors
R.L. Kerr
Magmatic inclusions in silicic and intermediate volcanic rocks Magmatic inclusions in silicic and intermediate volcanic rocks
Fine‐grained ellipsoidal inclusions from a few millimeters to over l m in size are present in many intermediate to silicic lava flows and domes. Only recently has it become widely accepted that such inclusions are chilled blobs of magma. Their magmatic origin is manifested by vesicularity and high groundmass porosity, by ellipsoidal shapes, by mingling at contacts with the host, and by...
Authors
Charles R. Bacon
Ice volumes on Cascade Volcanoes: Mount Rainier, Mount Hood, Three Sisters, and Mount Shasta Ice volumes on Cascade Volcanoes: Mount Rainier, Mount Hood, Three Sisters, and Mount Shasta
During the eruptions of Mount St. Helens the occurrence of floods and mudflows made apparent the need for predictive water-hazard analysis of other Cascade volcanoes. A basic requirement for such analysis is information about the volumes and distributions of snow and ice on other volcanoes. A radar unit contained in a backpack was used to make point measurements of ice thickness on major...
Authors
Carolyn L. Driedger, Paul M. Kennard
Deformation of poorly consolidated sediment during shallow emplacement of a basalt sill, Coso Range, California Deformation of poorly consolidated sediment during shallow emplacement of a basalt sill, Coso Range, California
A 150-m-long, wedge-shaped unit of folded and faulted marly siltstone crops out between undeformed sedimentary rocks on the north flank of the Coso Range, California. The several-meter-thick blunt end of this wedge abuts the north margin of a basaltic sill of comparable thickness. Chaotically deformed siltstone crops out locally at the margin of this sill, and at one locality breccia...
Authors
W. A. Duffield, C. R. Bacon, P.T. Delaney
Implications of silicic vent patterns for the presence of large crustal magma chambers Implications of silicic vent patterns for the presence of large crustal magma chambers
On the basis of the distribution of silicic vents, many volcanic fields can be grouped with (1) igneous systems that may be small and whose vent locations are controlled by regional tectonics, (2) those that include sizable crustal magma bodies which erupt at sites determined by their anomalous local stress fields, or (3) relatively small volume systems that are transitional between...
Authors
Charles R. Bacon