 |
| USGS earthquake shakemap. |
November 15, 2015 - KANSAS, UNITED STATES - An early Sunday morning earthquake was felt by some south-central Kansas residents.
The magnitude-4.3 earthquake occurred at 3:45 a.m. Sunday,
according to the U.S. Geological Survey website. It was centered near Fairview, Okla., west of Enid.
Residents in Wichita, Hutchinson, Kiowa, Conway Springs,
Medicine Lodge, Pratt, Kingman, Andover, Winfield, Udall, Haysville,
Derby and Valley Center reported feeling the quake to the Geological
Survey site.
If you felt it, you can report it on the Geological Survey's
Did You Feel It? webpage.
-
The Wichita Eagle.
Tectonic Summary - Earthquakes in the Stable Continental Region
Natural Occurring Earthquake Activity
Most of North America east of the Rocky Mountains has infrequent
earthquakes. Here and there earthquakes are more numerous, for example
in the New Madrid seismic zone centered on southeastern Missouri, in the
Charlevoix-Kamouraska seismic zone of eastern Quebec, in New England,
in the New York - Philadelphia - Wilmington urban corridor, and
elsewhere. However, most of the enormous region from the Rockies to the
Atlantic can go years without an earthquake large enough to be felt, and
several U.S. states have never reported a damaging earthquake.
Earthquakes east of the Rocky Mountains, although less frequent than in
the West, are typically felt over a much broader region than earthquakes
of similar magnitude in the west. East of the Rockies, an earthquake
can be felt over an area more than ten times larger than a similar
magnitude earthquake on the west coast. It would not be unusual for a
magnitude 4.0 earthquake in eastern or central North America to be felt
by a significant percentage of the population in many communities more
than 100 km (60 mi) from its source. A magnitude 5.5 earthquake in
eastern or central North America might be felt by much of the population
out to more than 500 km (300 mi) from its source. Earthquakes east of
the Rockies that are centered in populated areas and large enough to
cause damage are, similarly, likely to cause damage out to greater
distances than earthquakes of the same magnitude centered in western
North America.
Most earthquakes in North America east of the Rockies occur as faulting
within bedrock, usually miles deep. Few earthquakes east of the Rockies,
however, have been definitely linked to mapped geologic faults, in
contrast to the situation at plate boundaries such as California's San
Andreas fault system, where scientists can commonly use geologic
evidence to identify a fault that has produced a large earthquake and
that is likely to produce large future earthquakes. Scientists who study
eastern and central North America earthquakes often work from the
hypothesis that modern earthquakes occur as the result of slip on
preexisting faults that were formed in earlier geologic eras and that
have been reactivated under the current stress conditions. The bedrock
of Eastern North America is, however, laced with faults that were active
in earlier geologic eras, and few of these faults are known to have
been active in the current geologic era. In most areas east of the
Rockies, the likelihood of future damaging earthquakes is currently
estimated from the frequencies and sizes of instrumentally recorded
earthquakes or earthquakes documented in historical records.
Induced Seismicity
As is the case elsewhere in the world, there is evidence that some
central and eastern North America earthquakes have been triggered or
caused by human activities that have altered the stress conditions in
earth's crust sufficiently to induce faulting. Activities that have
induced felt earthquakes in some geologic environments have included
impoundment of water behind dams, injection of fluid into the earth's
crust, extraction of fluid or gas, and removal of rock in mining or
quarrying operations. In much of eastern and central North America, the
number of earthquakes suspected of having been induced is much smaller
than the number of natural earthquakes, but in some regions, such as the
south-central states of the U.S., a significant majority of recent
earthquakes are thought by many seismologists to have been
human-induced. Even within areas with many human-induced earthquakes,
however, the activity that seems to induce seismicity at one location
may be taking place at many other locations without inducing felt
earthquakes. In addition, regions with frequent induced earthquakes may
also be subject to damaging earthquakes that would have occurred
independently of human activity. Making a strong scientific case for a
causative link between a particular human activity and a particular
sequence of earthquakes typically involves special studies devoted
specifically to the question. Such investigations usually address the
process by which the suspected triggering activity might have
significantly altered stresses in the bedrock at the earthquake source,
and they commonly address the ways in which the characteristics of the
suspected human-triggered earthquakes differ from the characteristics of
natural earthquakes in the region. -
USGS.
Kansas - Earthquake History
The earliest, and possibly the strongest, shock reported within Kansas'
borders occurred April 24, 1867. Several persons were injured, though
not seriously. Plaster cracked, objects were thrown from shelves, and
doors and windows were shaken at Lawrence. The earthquake was also felt
strongly at Manhattan, where stones loosened on buildings and walls
cracked. A heavy wave, about two feet high, was observed on the Kansas
River at Manhattan. The tremor was felt over an area of 300,000 square
miles in Kansas, Missouri, Nebraska, Arkansas, Illinois, Indiana,
Kentucky, and possibly Ohio.
A moderate earthquake near Valley Falls, northeast of Topeka, on
November 8, 1875, was felt over about 8,000 square miles in eastern
Kansas and western Missouri. Dishes rattled; windows shook; some
buildings rocked or quivered (intensity V).
Eastern Kansas felt the effects of a strong earthquake centered near
Charleston, Missouri, in 1895. The October 31 shock affected about one
million square miles over 23 States. Topeka reported the strongest
effects in Kansas - houses shook and people were awakened. Dishes and
windows rattled in other towns.
The area around Dodge City and Meade, in western Kansas, was shaken with
an intensity V earthquake on October 27, 1904. Some reports indicated
three shocks were felt at Dodge City.
On January 7, 1906, a strong shock affected an area of about 10,000
square miles in Kansas, Missouri, and Nebraska. Chimneys were thrown
down and some cracks in walls were observed at Manhattan (intensity
VII). Houses and buildings vibrated at Topeka, where a loud roaring
sound was also heard. Some towns reported feeling two or three shocks. A
series of small aftershocks of the January 7 earthquake was felt in
Manhattan, the last being reported on January 23.
An earthquake on March 18, 1927, near White Cloud, in the extreme
northeastern portion of the State, rocked houses such that people rushed
out of them. The felt area was limited to about 300 square miles.
Four shocks - two on September 23, 1929, one each on October 21 and
December 7, 1929 - were reported from the same area of northeastern
Kansas. Houses shook over a broad area around Manhattan in September.
The total affected area covered approximately 15,000 square miles. The
October tremor was felt over an area of 8,000 square miles; that in
December covered only 1,000 square miles. The maximum reported intensity
of all these earthquakes was V.
A moderate earthquake was felt on February 20, 1933, over about 6,000
square miles in Norton and Decatur counties, Kansas, and Furnas and
Harlan counties, Nebraska. Buildings and houses swayed; dishes and
windows rattled; people ran out of their houses.
A damaging earthquake centered near El Reno, Oklahoma on April 9, 1952,
affected a total area of 140,000 square miles, including all of the
eastern half of Kansas. The magnitude 5.5 shock was felt in Kansas most
strongly (intensity V) at Medicine Lodge; intensity V effects were also
observed at Kansas City.
On January 6, 1956, minor damage occurred at Coats, Coldwater, Medicine
Lodge, and Wilmore, Kansas, and Alva, Oklahoma. The damage was limited
to loosened bricks, cracked plaster and chimneys, and objects knocked
from walls and shelves. Many observers reported being shaken from their
beds by the shock a few minutes before 6 a.m. The total felt area
covered approximately 16,000 square miles.
Another felt earthquake with an epicenter in Kansas occurred April 13,
1961. The area affected was about the same as that from the 1933 tremor,
principally Norton County, Kansas, and Furnas County, Nebraska.
Intensity V was the maximum reported from this region.
The November 9, 1968, earthquake centered in southern Illinois was felt
moderately throughout the eastern portion of Kansas. All or parts of 23
states were affected by this magnitude 5.3 shock. -
USGS.