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Geology topics

G. Reagor

Publications and source records attributed to G. Reagor.

4 recordsLinked to original sources
USGS1992

Damage and intensity survey

A trio of widely felt earthquakes struck the Cape Mendocino region of northern California in an 18-hour period on April 25-26, 1992. Collectively these shocks caused significant damage to older structures in the sparsely populated, mountainous epicentral region. The area where the first shock, the strongest of the three (M=7.1), was felt included southwestern Oregon and extended as far south as Monterey, California. A field team (the tuhors) from the National Earthquake Information Center (USGS) conducted a damage survey of the epicentral area in the week following the earthquakes. Detailed information about damage and where and how strongly the earthquakes were felt was obtained through interviews with local residents and personal observations.

California↗
USGS1988

The 1987 Whittier Narrows earthquake in the Los Angeles metropolitan area, California

The Whittier Narrows earthquake sequence (local magnitude, M L = 5.9), which caused over 358-million dollars damage, indicates that assessments of earthquake hazards in the Los Angeles metropolitan area may be underestimated. The sequence ruptured a previously unidentified thrust fault that may be part of a large system of thrust faults that extends across the entire east-west length of the northern margin of the Los Angeles basin. Peak horizontal accelerations from the main shock, which were measured at ground level and in structures, were as high as 0.6 g (where g is the acceleration of gravity at sea level) within 50 kilometers of the epicenter. The distribution of the modified Mercalli intensity VII reflects a broad north-south elongated zone of damage that is approximately centered on the main shock epicenter.

California↗
USGS1976

A revised “earthquake report” questionnaire

The revised “Earthquake Report” questionnaire introduced here is designed to restrict the replies on the effects of earthquakes as closely as possible to a set of effects that can be evaluated by use of a computer program. Differences in intensity resulting from evaluation by different individuals using their own qualitative procedures can then be eliminated and static rules for evaluating the questionnaire for the assigning of intensity values can be established.

Seismological Research Letters↗