Earthquake sequences and b values in the southeast United States

1974 ◽  
Vol 64 (1) ◽  
pp. 267-273
Author(s):  
Leland Timothy Long
Keyword(s):  
United States ◽  
South Carolina ◽  
B Value ◽  
Earthquake Activity ◽  
Southeast United States ◽  
B Values ◽  
History Of ◽  
Earthquake Sequences ◽  
Foreshock Activity ◽  
Epicentral Region

abstract Aftershock and foreshock activity within 12 hr of the July 13, 1971 earthquake near Seneca, South Carolina, indicates a b value of 0.9 at ML = 3.0. Approximately 40 events recorded in a 5-day aftershock survey near Seneca indicate a b value of 1.7 at ML = 0.5. A sequence of over 40 events occurring west of McCormick, South Carolina, indicates a b value of 1.3 at ML = 2.4. The McCormick sequence was active for 4 months. Unlike the Seneca region, the McCormick region has a history of earthquake activity. Examinations of other published southeastern b values suggest that southeastern United States earthquakes originate from conditions of ambient stress which vary with epicentral region or magnitude.

Historical and recent seismic activity in South Carolina

1972 ◽  
Vol 62 (3) ◽  
pp. 851-864 ◽  
Author(s):  
G. A. Bollinger
Keyword(s):  
South Carolina ◽  
Seismic Activity ◽  
B Value ◽  
Low Noise ◽  
The State ◽  
Seismic Zone ◽  
Recurrence Relationship ◽  
Noise Data ◽  
History Of ◽  
Felt Area

Abstract The seismic history of South Carolina is dominated by the great Charleston earthquake of August 31, 1886. In addition to having several unusual aspects (region essentially free from shocks for preceding 200 years, large felt area, dual epicenter points, “low intensity zone” in West Virginia), that intensity X event seriously perturbed the seismic regime of the area for at least the following 30 years. Of 438 earthquakes reported to have occurred in the state between 1754 and 1971, 402 have been in the Charleston-Summerville area. The remaining 36 shocks form a southeasterly-trending zone of activity that is transverse to the structural grain of the Appalachians. For the 60 shocks assigned an intensity value (1886-1971), a recurrence relationship between the number of earthquakes “N” of maximum intensity “I0” was found to be log N = 0.52-0.31 I0 for IV ≦ I0 ≦ VIII. This corresponds to a “b” value of 0.5 ± 0.1 in log N versus M relationship assuming M = 1 + (2/3)I0. These data suggest a frequency of seismic activity comparable to that reported for the New Madrid seismic zone. Three months of microearthquake monitoring in the Charleston area during the summer of 1971 yielded 505 hr of low-noise data. Sixty-one earthquakes, primarily in swarm occurrence, were recorded. An h value of 1.8 ± 0.5 was determined for these microshock events. This value is similar to that previously observed for a swarm sequence in New Jersey. Four shocks occurred in the state during 1971. Three of these events (May 19, July 31, August 11) were in the central part of the state near Orangeburg, while the third event (July 13) was near Seneca in northwestern South Carolina. All three events had 3.0 < ML < 4.0. Similar episodes of three or four shocks in 1 year happened in 1956 and again in 1965. The Orangeburg area had, according to historical data, been previously free of earthquake epicenters.

All for Liberty

2021 ◽  
Author(s):  
Jeff Strickland
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
South Carolina ◽  
American South ◽  
The United States ◽  
Pivotal Role ◽  
Slave Rebellion ◽  
Slave Revolt ◽  
History Of

Jeff Strickland tells the powerful story of Nicholas Kelly, the enslaved craftsman who led the Charleston Workhouse Slave Rebellion, the largest slave revolt in the history of the antebellum American South. With two accomplices, some sledgehammers, and pickaxes, Nicholas risked his life and helped thirty-six fellow enslaved people escape the workhouse where they had been sent by their enslavers to be tortured. While Nat Turner, Gabriel Prosser, and Denmark Vesey remain the most recognizable rebels, the pivotal role of Nicholas Kelly is often forgotten. All for Liberty centers his rebellion as a decisive moment leading up to the secession of South Carolina from the United States in 1861. This compelling micro-history navigates between Nicholas's story and the Age of Atlantic Revolutions, while also considering the parallels between race and incarceration in the nineteenth century and in modern America. Never before has the story of Nicholas Kelly been so eloquently told.

Free the Land

2020 ◽  
Author(s):  
Edward Onaci
Keyword(s):  
United States ◽  
South Carolina ◽  
Black Americans ◽  
The United States ◽  
Power Politics ◽  
Independence Movement ◽  
Political Struggles ◽  
History Of ◽  
The Republic

On March 31, 1968, over 500 Black nationalists convened in Detroit to begin the process of securing independence from the United States. Many concluded that Black Americans' best remaining hope for liberation was the creation of a sovereign nation-state, the Republic of New Afrika (RNA). New Afrikan citizens traced boundaries that encompassed a large portion of the South--including South Carolina, Georgia, Alabama, Mississippi, and Louisiana--as part of their demand for reparation. As champions of these goals, they framed their struggle as one that would allow the descendants of enslaved people to choose freely whether they should be citizens of the United States. New Afrikans also argued for financial restitution for the enslavement and subsequent inhumane treatment of Black Americans. The struggle to "Free the Land" remains active to this day. This book is the first to tell the full history of the RNA and the New Afrikan Independence Movement. Edward Onaci shows how New Afrikans remade their lifestyles and daily activities to create a self-consciously revolutionary culture, and it argues that the RNA's tactics and ideology were essential to the evolution of Black political struggles. Onaci expands the story of Black Power politics, shedding new light on the long-term legacies of mid-century Black Nationalism.

scholarly journals Economic Contributions of the Dairy Farming and Dairy Product Manufacturing Industries in the Southeast United States in 2005

EDIS ◽  
2008 ◽  
Vol 2008 (6) ◽  
Author(s):  
Thomas J. Stevens ◽  
Alan W. Hodges ◽  
W. David Mulkey ◽  
Richard L. Kilmer
Keyword(s):  
United States ◽  
South Carolina ◽  
Dairy Product ◽  
Dairy Farm ◽  
Resource Economics ◽  
Dairy Farming ◽  
Manufacturing Industries ◽  
Southeast United States ◽  
Farm Production ◽  
Product Manufacturing

FE731, a 32-page analysis by Thomas J. Stevens, Alan W. Hodges, W. David Mulkey, and Richard L. Kilmer, estimates the economic contributions of the dairy farm production and dairy product manufacturing industries in five southeastern states (Alabama, Florida, Georgia, South Carolina, and Tennessee) during 2005. Includes references. Published by the UF Department of Food and Resource Economics, August 2008.

History, Politics, and Health in Early American Thought: The Case of David Ramsay

1979 ◽  
Vol 13 (1) ◽  
pp. 37-56
Author(s):  
Lawrence J. Friedman ◽  
Arthur H. Shaffer
Keyword(s):  
United States ◽  
South Carolina ◽  
American Revolution ◽  
General Pattern ◽  
Historical Analysis ◽  
The United States ◽  
Historical Narrative ◽  
Early American ◽  
History Of ◽  
The Revolution

In 1785 physician-politician David Ramsay of Charleston published The History of the Revolution of South Carolina. Contemporaries praised it highly. Four years later Ramsay produced a more ambitious work, The History of the American Revolution. It established his reputation both in America and abroad as the new nation's leading historian. Thus in a few short years Ramsay went from a locally prominent physician and State legislator to an important national cultural and literary figure. The American reading public found his approach to history to its tastes. He expressed a set of ideas about American history in general and the Revolution in particular that were common currency in the United States. But he expressed them for the first time in well-reasoned and documented historical narrative: in volumes that were suitably pro-American, yet judicious in their treatment of Britain, that made a strong case for American uniqueness while maintaining the ideal of the United States as a model for the world.Ramsay's histories alone would attract our interest as the first and most influential historical analysis of the American Revolution and the ratification of the Federal Constitution. But Ramsay's writings and his career as physician and politician are also significant because they launch us upon a journey into the mind of one of the new nation's most articulate spokesmen on historical, political, and medical issues. There is, to be sure, little in the general pattern of his life to distinguish him from a number of his contemporaries among the professions and political figures of second rank. Ramsay seldom formulated original ideas. His importance was not simply, or even primarily, that of a political or historical philosopher or medical innovator.

scholarly journals Climatology and Trends in Hourly Precipitation for the Southeast United States

2019 ◽  
Vol 20 (8) ◽  
pp. 1737-1755 ◽  
Author(s):  
Vincent M. Brown ◽  
Barry D. Keim ◽  
Alan W. Black
Keyword(s):  
United States ◽  
South Carolina ◽  
Gulf Coast ◽  
Average Duration ◽  
Winter Precipitation ◽  
Precipitation Event ◽  
Southeast United States ◽  
Hourly Precipitation ◽  
Precipitation Characteristics ◽  
Precipitation Events

Abstract This research introduces a climatology of hourly precipitation characteristics, investigates trends in precipitation hours (PH) and hourly accumulation, and uses four different time series to determine if precipitation intensity is changing across the southeastern United States from 1960 to 2017. Results indicate hourly intensity significantly increased at 44% (22/50) of the stations, accompanied by an increase in average hourly accumulation at 40% of the sites analyzed (20/50). The average duration of precipitation events decreased at 82% (41/50) of the stations. However, the frequency of 90th percentile hourly events and events above station-specific average hourly totals did not show a broad increase similar to hourly intensity. It seems hourly events are becoming heavier on average, while the duration of the average precipitation event is decreasing. Geographically, heavy hourly events are more frequent along the Gulf Coast and decrease inland. PH significantly decreased across South Carolina, Georgia, and northern Florida, mainly due to significant decreases in winter (DJF) and spring (MAM). Decreases in PH during spring were contained to Georgia and South Carolina and were accompanied by a decrease in accumulation. Decreases in PH during winter were more widespread and did not exhibit a broad decrease in accumulation, suggesting winter precipitation across that portion of the region is becoming more intense.

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