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OF AEIC
SEISMOGRAMS
HISTORY
MAP EARTHQUAKE & FAULT MAPS
AGENCIES
SEISMO- SEARCHING
THE AEIC
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July 9, 2006 23 Miles Northwest of Prescott Two earthquakes occurred on Sunday morning July 9th, approximately 23 miles (38 km) northwest of Prescott, Arizona. The first of magnitude 2/5 occurred at 8:22 MST. This was followed by a larger tremor of magnitude 3.0 at 10:45 MST. The geographic location includes the western boundary of Chino Valley and is an area of relatively low level seismicity. The nearest significant historic activity included the M 4.9 Chino Valley tremor of February 4, 1976, and aftershocks. The nearest known active fault to the July 9th tremors is the Chino Valley fault on the east side of Chino Valley. No felt reports have been received at he4 Arizona Earthquake Information Center.
August 16, 2005 ANTELOPE HILLS The Antelope Hills area 26 miles north of Flagstaff was the site of a M2.7 earthquake on August 16, 2005 at 12:40 am. This tremor was felt locally but caused no damage. The Antelope Hills area is one of infrequent seismic activity, but is the epicenter region of the September 24, 1910 M6.0 tremor, one of the three largest in Arizona recorded history. Only 12 tremors have been located in this area since 1910, the last in 1999. The two largest were a M5.0 in 1959 that was felt in Flagstaff, and a M4.4 in 1966. The August 16, 2005 tremor was recorded by the station of the Northern Arizona network. The preliminary earthquake data are as follows:
July 5, 2005 BLUE RIDGE AREA The Blue Ridge area of Arizona, southeast of Flagstaff was the site of a M3.2 earthquake on July 1, 2005 at 10:41am local time. No felt reports have been received by the Arizona Earthquake Information Center. The tremor was recorded by the northern Arizona network of seismograph stations (see illustration below) and was located at 34.732N x 111.00W. This epicenter is in the same area as continuing activity that began on January 28, 2005 with a M4.0 event and culminated with a M4.6 tremor that was widely felt throughout northern and central Arizona. The preliminary data are as follows:
March 15, 2005 BLUE RIDGE AREA EARTHQUAKE SWARMS The Blue Ridge area of the Mogollon Plateau has been the site of a swarm of earthquakes beginning in late January 2005. The largest events have been a M4.0 on January 28, a second M4.0 on January 30, and the largest so far a M4.6 on March 2 at 5:12am local time that was felt over much of central and northern Arizona. These larger tremors have been accompanied and followed by numerous smaller earthquakes in the area that have continued up to the present. The tremors are too small to have created ground breakage and fault slip at the surface although a number of prominent faults do occupy the Blue Ridge area, including the Quayle Hill fault that crosses State Route 87. The swarm activity presently occurring mirrors the same type of activity occurring in this area in 1989. The 1989 swarm began on April 18, 1989 with a M3.4 tremor and continued until September 6, 1989. More information on this 1989 swarm may be found in the Catalog of Arizona Earthquakes (1830-2005) which is on the AEIC website. The information on the M≥4.0 tremors of the presently occurring 2005 swarm are given below along with the wave forms of the M4.6 event as recorded by the AEIC network stations.
March 27, 2003 COLORADO CITY AREA A magnitude 3.0 earthquake struck at about 2:11pm MST on March 25, 2003 15 miles south of Colorado City, AZ (see map). The tremor was recorded by the stations of the AEIC, as well as those of the University of Utah, both members of the Advanced National Seismic System. No damage was reported. This area has had similar earthquakes in the past, in general ranging form 3.0 up to a 4.4 magnitude event that occurred on February 15, 1962. The largest earthquake in the region occurred near Fredonia, AZ of magnitude 5.7, on July 21, 1959. The preliminary data are as follows:
May 27, 2002 WINSLOW AREA A magnitude 2.9 earthquake struck 5 miles northeast of Winslow, AZ beneath Ives Mesa on May 27, 2002 at about 1:11am local time. No reports that the earthquake was felt have been received at the center. The previous tremor of note in the Winslow area was a magnitude 3.9 that occurred about 30 miles south of Winslow on January 8, 1998. The 1998 event was felt in Winslow and Holbrook and caused minor damage in Holbrook. The May 27, 2002 tremor cannot be located on any known fault. The strongest earthquake in northern Arizona in 43 years was a magnitude 5.3 trembler that occurred on April 29, 1993 and was centered at Cataract Creek, just south of the junction of AZ Hwy 64 and U.S. Hwy 180 and was felt in Grand Canyon Village and also in Flagstaff. The earthquake data are as follows:
May 22, 2002 GRAND CANYON VILLAGE AREA A Magnitude 3.3 earthquake struck 14 miles southwest of Grand Canyon Village on May 22, 2002 at 11:29am local time. No reports that the earthquake was felt have been received at the center. The area near Grand Canyon Village is one of the most seismically active areas in Arizona. As recently as March 5, 1989 two magnitude 4.0 tremors occurred 5 miles southwest of the village within nine hours of one another. The May 22 event cannot be located on any known fault. The strongest earthquake in northern Arizona in 43 years was a magnitude 5.3 trembler that was centered at Cataract Creek, just south of the junction of AZ Hwy 64 and U.S. Hwy 180 was felt in Grand Canyon Village and also in Flagstaff. The earthquake data is as follows:
April 22, 2002 FLAGSTAFF AREA A magnitude 2.3 earthquake struck on the northeast side of the San Francisco Peaks on April 20,2002 at 12:17pm. The earthquake epicenter was located 13 miles (21 km) north of Flagstaff and 6 miles (10 km) west of Sunset Crater. The earthquake cannot be located on any known active fault. No reports that the earthquake was felt by anyone in Flagstaff have been received. This was a very small tremor. The Flagstaff area has experienced moderate earthquakes in the past. In 1910, a magnitude 6.0 (estimated) earthquake occurred in the same area and in 1912 a magnitude 6.2 (estimated) quake occurred west of Flagstaff. The strongest earthquake in recent time was a magnitude 5.3 trembler that was centered at Cataract Creek just south of the junction of AZ Hwy 64 and U.S. Hwy 180 and was felt in Flagstaff and the Grand Canyon. The earthquake data is as follows:
April 18, 2002 FREDONIA AREA A magnitude 3.0 earthquake struck just south of the Arizona-Utah state line on April 14, 2002 at 11:53pm. The earthquake was centered approximately 11 mile (17.5 km) southeast of the town of Fredonia, AZ on the Kanab Plateau. This tremor was close to the location of the July 21, 1959 Fredonia earthquake of magnitude 5.75. Neither quake can be located on any known active fault. No reports of damage or that the earthquake was felt by anyone in nearby Fredonia have been received. The earthquake data is as follows:
May 4, 2000 North Rim and Painted Desert Earthquake Swarms During the past two days earthquakes have been occurring on the North Rim of the Grand Canyon and in the Painted Desert region of northern Arizona. The largest of these earthquakes was a magnitude 3.2 earthquake in the Painted Desert about 15 miles southwest of Tuba City and 19 miles east of Desert View at a depth of about 12 miles below the surface. The magnitude 3.2 Painted Desert earthquake occurred at 11:48 pm Wednesday night, May 3rd. The North Rim earthquakes have been centered along Bright Angel Canyon about 9 miles northeast of the Grand Canyon Village. The largest of which is a magnitude 2.5 that occurred at 10:29 pm on Tuesday night May 2nd. The earthquake swarms have occurred in a sparsely populated areas and no felt or damage reports have been received at the center. The data for the earthquake are as follows:
February 21, 2000 Diamond Creek Earthquake An earthquake of magnitude 3.0 struck about 19 miles northeast of Peach Springs and 36 miles northwest of Seligman on the Hualapai Reservation of northwestern Arizona. The earthquake occurred at 8:31 pm local time on Monday night February 21st. The earthquake hypocenter is along the Aubrey fault that forms the Aubrey Cliffs north of Seligman. This earthquake occurred in a sparsely populated area and no felt or damage reports have been received at the center. The data for the earthquake are as follows:
December 6, 1999 Mountainaire Earthquake An earthquake of magnitude 3.1 struck about 5 miles south of Mountainaire and 5 miles north of Munds Park this morning at 7:20 am local time. This region is within northern Arizona's seismic belt and is subject to several small earthquakes per year. The last earthquake in this area with a magnitude of 3.0 or greater occurred on February 6, 1995 along the Lake Mary fault. The data for this morning's earthquake are as follows:
February 23, 1999 Fredonia Earthquake A magnitude 3.4 earthquake struck about eight miles east of Fredonia, Arizona last night at 8:20 p.m. local time. The same area was struck by a magnitude 5.9 quake in 1959. The region of last night's quake is sparsely populated and no felt or damage reports have been received at the center. The earthquake data are as follows:
February 11, 1999 Wupatki and Grand Canyon Earthquakes The northern Arizona region has experienced two earthquakes during the last two days:
These earthquakes occurred in sparsely populated areas and no felt or damage reports have been received at the center. The earthquake data are as follows:
November 24, 1998 RAINBOW PLATEAU, LAKE POWELL AREA A magnitude 4.1 earthquake struck 34 miles east of Page, Arizona this morning at 11:52 a.m. local time. The earthquake was preceded by a magnitude 2.7 foreshock at 9:52 a.m. local time. The epicenters are on the Rainbow Plateau just south of the Utah border and Lake Powell. These earthquakes appear to be a separate sequence from the Grand Canyon earthquakes three weeks ago. The region of this morning's earthquake is sparsely populated and no felt or damage reports have been received at the center. The earthquake data are as follows:
November 8, 1998 GRAND CANYON REGION Last evening at 5:24 p.m. local time (Saturday night 11/7) another earthquake struck the Grand Canyon region. This event was a magnitude 3.2 centered 13 miles northwest of Grand Canyon Village, approximately 6 miles beneath Point Sublime. This earthquake follows a swarm of small events during the week as well as a magnitude 3.4 earthquake that struck the South Rim area on October 31st at 8:24 p.m. local time. Last night's earthquake, as well as the earthquake on October 31st and several of the smaller earthquakes during the last week were felt by rangers and campers at Phantom Ranch. No damage has been reported. The South Rim area continues to be the most seismically active region of Arizona, including earthquakes in March 1992 with magnitudes of 4.0 and 4.5. The magnitude 4.9 and 5.4 earthquakes of April 1993 occurred 30 miles south of last night's epicenter. The earthquake data are as follows:
November 1, 1998 SOUTH RIM, GRAND CANYON & TUBA CITY REGIONS A magnitude 3.4 earthquake struck the South Rim area of the Grand Canyon yesterday evening October 31st at 8:24 pm local time. The earthquake was centered about 3 miles southwest of the Grand Canyon Village. The South Rim area continues to be the most seismically active region of Arizona, including earthquakes in March 1992 with magnitudes of 4.0 and 4.5. The magnitude 4.9 and 5.4 earthquakes of April 1993 occurred 20 miles south of last night's epicenters. The South Rim earthquake data are as follows:
In addition, a magnitude 3.4 earthquake struck the Tuba City region early Sunday morning October 18th at 12:13 am. The epicenter was 15 miles southeast of Tuba City. That earthquake was felt by several residents of Tuba City, but occurred in a region where we have not previously detected earthquakes. The Tuba City earthquake data are as follows:
October 18, 1998 WINSLOW AREA An earthquake of magnitude 3.4 struck a region 63 miles southeast of Flagstaff, about 14 miles southeast of Winslow last night at 12:13am. The earthquake is an aftershock of the magnitude 3.9 that stuck the region on January 6, 1998. The earthquake was felt in Tuba City. No reports of damage have been received at the center. The data are as follows:
January 6, 1998 WINSLOW AREA A earthquake of Richter Magnitude 3.9 shook a wide region of northern Arizona this morning. The tremor was felt in Winslow, Holbrook, and Flagstaff. Unconfirmed reports were received of minor damage at Holbrook. So far no aftershocks of magnitude 3.0 or greater have occurred. The earthquake occurred about 15 miles southeast of Winslow and 66 miles southeast of Flagstaff in an area to the northeast of activity that occurred in 1988 and 1989 when there was a number of events culminating in the April 18, 1989 Chavez Mountain tremor of magnitude 3.4. The last event of the size of this morning's tremor in this region was on October 8, 1953. The data for this morning's earthquake are as follows:
August 26, 1997 EARTHQUAKES AT GRAND CANYON VILLAGE An earthquake of ML 2.8 struck in the region of Grand Canyon Village late last night. The earthquake occurred at 11:52pm late Monday night. It was preceded at 11:50pm by a ML 2.0 foreshock. Several park rangers at Phantom Ranch reported feeling the larger shock, but no damage was reported. The earthquakes were centered in a region about 72 miles northwest of Flagstaff and about three miles south of the Rim. This area continues to be the most seismically active in Arizona. The South Rim activity began with a a swarm of earthquakes in September 1988, and the largest have included magnitude 4.0 and 4.5 earthquakes that struck the region in March of 1991. The magnitude 5.4 earthquake that shook northern Arizona in April 1993 occurred about 30 miles south of last night's epicenters near Valle, Arizona. The data for last night's earthquakes are as follows:
May 29, 1997 RECENT EARTHQUAKES IN ARIZONA STRIP COUNTRY An earthquake of ML 3.3 shook the Arizona strip region last night. The earthquake was felt and recorded at Pipe Springs National Monument and minor damage was reported by the Park Service. The earthquake occurred in the same location as three ML 2.8-3.5 events in January of this year. These earthquakes occurred approximately 25 km south of the Arizona-Utah border, in between two major fault systems, the Hurricane to the west and the Toroweap fault system to the east. These earthquakes occurred 55 km southwest of Fredonia, Arizona, the location of a ML 1.5-2.5 earthquakes in the vicinity of Grand Canyon Village between 10:00pm last night and 2:00am this morning. The data for last night's earthquake is as follows:
April 6, 1997 CATARACT CREEK FAULT SYSTEM An earthquake of magnitude 3.0 struck a region 26 miles northwest of Flagstaff, near Red Mountain, this morning. This earthquake is an aftershock of last week's magnitude 3.7 Red Mountain earthquake. This morning's quake occurred at 4:48am local time and was felt in the community of Valle. The temblor this morning is the seventh felt earthquake in northern Arizona this year. No damage has been reported. These earthquakes have occurred within the Cataract Creek fault system. The magnitudes 4.9 and 5.4 earthquakes of April 1993 occurred about 20 miles northwest of this morning's epicenters. The data are as follows:
March 31, 1997 CATARACT CREEK FAULT SYSTEM An earthquake of magnitude 3.7 struck a region 26 miles northwest of Flagstaff, near Red Mountain, this morning. The earthquake occurred at 12:34am local time, and was followed by a magnitude 3.0 aftershock at 8:46 this morning. The last earthquakes to occur in this region were a group of magnitude 2.6 to 3.0 earthquakes in September 1994. These earthquakes have occurred within the Cataract Creek fault system. The magnitude 4.9 and 5.4 earthquakes of April 1993 occurred about 20 miles northwest of this morning's epicenters. The data are as follows:
No damage has been reported. Several persons phoned the center early this morning to report that they felt minor shaking. January 30, 1996 CATARACT CREEK FAULT SYSTEM An earthquake of magnitude 2.4 on the Richter Scale occurred in the Valle area yesterday, January 29, 1996. It occurred at 10:00am yesterday morning. The earthquake was preceded by a foreshock of magnitude 1.8 on the Richter Scale nine hours earlier. The data for yesterday morning's earthquakes are as follows:
Both of these earthquakes occurred approximately 35 miles northwest of Flagstaff, about 10 miles northwest of Kendrick Peak. Yesterday's magnitude 2.4 earthquake was felt in Valle, AZ. The recent earthquakes occurred within the Cataract Creek Fault System. An earthquake sequence in September 1994, including magnitudes 2.6 and 3.0 events, occurred in approximately the same area as yesterday's events. A sequence of earthquakes also occurred in April 1993. Two notable earthquakes in the latter sequence registered magnitudes 4.9 and 5.4. Both of these events were widely felt through out northern Arizona. April 17, 1995 GRAND CANYON VILLAGE AREA An earthquake of magnitude 4.1 on the Richter scale struck the Grand Canyon region about 5 miles southwest of Grand Canyon Village. The earthquake occurred just before 1:24am this morning. The South Rim area in the vicinity of Grand Canyon Village remains the most seismically active in Arizona. The data for this morning's earthquake are as follows:
We have reports that today's earthquake was felt in Tusayan, Grand Canyon Village, Valle, Williams and Flagstaff. Broken windows were reported in Tusayan. Since the late 1980's the following earthquakes have been recorded in the vicinity of this morning's:
February 6, 1995 FLAGSTAFF AREA An earthquake of magnitude 3.0 struck the Lake Mary region about 6 miles southeast of Flagstaff this morning. The last earthquakes to occur in this region were a group of 5-7 earthquakes in October of 1979. The Lake Mary fault thaqt runs parallel to Upper and Lower Lake Mary is within the Cataract Creek fault system. The magnitude 4.9 and 5.4 earthquakes of April 1993 occurred about 60 miles northwest of this morning's epicenter within the same fault system. The data are as follows:
February 1, 1995 GRAND CANYON VILLAGE AREA Two small earthquakes occurred near the South Rim of the Grand Canyon yesterday. They struck about 5 miles south of the Grand Canyon Village within a region that continues to be the most seismically active region of Arizona, including a swarm in March 1992 with earthquakes of magnitude 4.0 and 4.5. The magnitudes 4.9 and 5.4 earthquakes of April 1993 occurred 20 miles south of yesterday's epicenters. The data are as follows:
September 30, 1994 CATARACT CREEK Two small northern Arizona earthquakes have occurred during the past week. The epicenters are located approximately 30 miles northwest of Flagstaff, AZ. About 6 miles northwest of Kendrick Peak. The recent earthquakes occurred within the Cataract Creek Fault System. An earthquake sequence in April 1003, including magnitudes 4.9 and 5.4 events, occurred along the same fault system about 50 miles northwest of Flagstaff in the region of Valle, Arizona The data are as follows:
April 25, 1993 CATARACT CREEK The earthquake was located within the Cataract Creek fault system on the Colorado Plateau. The fault system consists of a zone of northwest trending faults approximately 20 miles in width and 70 miles in length. It extends from South of the Grand Canyon to South of Flagstaff. The southeastern end of the Cataract Creek fault system may have been the cause of the 1906 Flagstaff earthquake of ML = 6.2, which did some damage to un-reinforced masonry structures in the downtown Flagstaff area. Although a ML = 4.5 event shook the South Rim of the Grand Canyon last March, this years 4.9 tremor is the largest in AZ since the 1976 ML = 5.1 that shook the Chino Valley-Prescott area. Ground motion from the earthquake was recorded at station FLAG, located in Flagstaff, for about 5 minutes 40 seconds. However, the event was only felt for 10 to 20 seconds. Seismograph stations as far as Alaska and Virginia recorded the event. The depth of the event has been fixed at 10 km. A netw3ork of portable seismograph stations was in operation in the epicenter area for two weeks following the event. The temporary network provided detailed information on the size and location of aftershocks, and may provide a clue as to the specific fault that caused this activity. There were over 600 earthquakes detected in the two weeks the stations were operating, of which, approximately 130 were locatable. The earthquake data is as follows:
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