United States earthquakes, 1970

Coffman, J.L.; Hake, C. A. von

doi:10.3133/ofr84970

Cited by 3 publications

(3 citation statements)

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“…DYFI questionnaires were designed to match the descriptions of MMI intensities and are assumed to be equivalent (D. Wald, written communication, 2011). Damage reports from events before 2000 were compiled from different sources [ Bodle and Murphy , 1984; Coffman and von Hake , 1984a; Coffman and Stover , 1984; Coffman and von Hake , 1984b; Stover and Brewer , 1991]. The number of locations of intensity reports for these calibration events varies from 3 to 55.…”

Section: Results: Variations In Intensity Attenuationmentioning

confidence: 99%

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Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region

2011

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We evaluate the long‐term seismic activity of the North‐American/Caribbean plate boundary from 500 years of historical earthquake damage reports. The 2010 Haiti earthquakes and other earthquakes were used to derive regional attenuation relationships between earthquake intensity, magnitude, and distance from the reported damage to the epicenter, for Hispaniola and for Puerto Rico and the Virgin Islands. The attenuation relationship for Hispaniola earthquakes and northern Lesser Antilles earthquakes is similar to that for California earthquakes, indicating a relatively rapid attenuation of damage intensity with distance. Intensities in Puerto Rico and the Virgin Islands decrease less rapidly with distance. We use the intensity‐magnitude relationships to systematically search for the location and intensity magnitude MI which best fit all the reported damage for historical earthquakes. Many events occurred in the 20th‐century along the plate‐boundary segment from central Hispaniola to the NW tip of Puerto Rico, but earlier events from this segment were not identified. The remaining plate boundary to the east to Guadeloupe is probably not associated with M > 8 historical subduction‐zone earthquakes. The May 2, 1787 earthquake, previously assigned an M 8–8.25, is probably only MI 6.9 and could be located north, west or SW of Puerto Rico. An MI 6.9 earthquake on July 11, 1785 was probably located north or east of the Virgin Islands. We located MI < 8 historical earthquakes on April 5, 1690, February 8, 1843, and October 8, 1974 in the northern Lesser Antilles within the arc. We speculate that the December 2, 1562 (MI 7.7) and May 7, 1842 (MI 7.6) earthquakes ruptured the Septentrional Fault in northern Hispaniola. If so, the recurrence interval on the central Septentrional Fault is ∼300 years, and only 170 years has elapsed since the last event. The recurrence interval of large earthquakes along the Hispaniola subduction segment is likely longer than the historical record. Intra‐arc M ≥ 7.0 earthquakes may occur every 75–100 years in the 410‐km‐long segment between the Virgin Islands and Guadeloupe.

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Section: Results: Variations In Intensity Attenuationmentioning

confidence: 99%

“… a L&B, Lynch and Bodle [1948]; C&vH 1984a, Coffman and von Hake [1984a]; C&vH 1984b, Coffman and von Hake [1984b]; C&vH 1984c, Coffman and von Hake [1984c]; C&S, Coffman and Stover [1984]; S&B, Stover and Brewer [1991]; DYFI, Did You Feel It (earthquake.usgs.gov/dyfi/). …”

Section: Results: Variations In Intensity Attenuationmentioning

confidence: 99%

Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region

2011

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“…The largest earthquake ever recorded in the western mountain region of North America occurred on May 3, 1887 (Modified Mercalli intensity VIII-IX). Its epicenter was near Baviste, Sonora, Mexico, latitude 31 ° N., longitude 109° W., about 30 km (18 mi) south of the common junction of New Mexico, Arizona, and Sonora (Coffman and von Hake, 1973). At present, the Lightning Dock area seems to be seismically inactive.…”

Section: Seismicity and Heat Flowmentioning

confidence: 95%

Geology and geothermal waters of Lightning Dock region, Animas Valley and Pyramid Mountains, Hidalgo County, New Mexico

Elston¹,

Deal²,

Logsdon³

1983

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This circular covers the geology of the Pyramid Peak, Swallow Fork Peak, Table Top Mountain, and South Pyramid Peak 7 1/2-min quadrangles, which include the Lightning Dock KGRA. Hot wells (70-115.5 °C) seem to be structurally controlled by intersections of the ring-fracture zone of an Oligocene ash-flow tuff cauldron (Muir cauldron), a Miocene-to-Holocene north-trending basin-and-range fault (Animas Valley fault), and a northeast-trending lineament that appears to control anomalously heated underground waters and Pliocene-Pleistocene basalt cones in the San Bernardino, San Simon, and Animas Valleys. The Muir cauldron, approximately 20 km in diameter, collapsed in two stages, each associated with the eruption of a rhyolite ash-flow-tuff sheet and of ringfracture domes. Most of the hydrothermal alteration of the Lightning Dock KGRA is related to the first stage of eruption and collapse, not to the modern geothermal system. Contrary to previous reports, no silicic volcanic rocks younger than basin-and-range faulting are known; unconformities beneath rhyolite ring-fracture domes are caused by Oligocene caldera collapse, not by basin-and-range faulting. The Animas Valley is the site of widespread post-20 m.y. travertine deposits and near-surface veins of calcite, fluorite, and/or psilomelane, controlled by north-or northwest-trending basin-and-range faults. The fluoride-bearing waters of the Lightning Dock KGRA may be a late stage of this hydrothermal activity. Distribution of Pliocene-Pleistocene basalt suggests that deepseated basalt near the solidus may be the ultimate heat source.

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Estimating Locations and Magnitudes of Earthquakes in Eastern North America from Modified Mercalli Intensities

Bakun¹

2003

Bulletin of the Seismological Society of America

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United States earthquakes, 1970

Cited by 3 publications

References 0 publications

Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region

Historical perspective on seismic hazard to Hispaniola and the northeast Caribbean region

Geology and geothermal waters of Lightning Dock region, Animas Valley and Pyramid Mountains, Hidalgo County, New Mexico

Estimating Locations and Magnitudes of Earthquakes in Eastern North America from Modified Mercalli Intensities

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