AZGS Web Posts

Ho hum, another M3.2 Duncan aftershock

Arizona Geology Blog - Thu, 2014-08-21 02:32

Aftershocks continue in the Duncan area with a M3.2 event on Tuesday night at about 8:16 pm.
[right, orange star marks epicenter. Credit, USGS]

Smaller aftershocks are more common but are not being reported by the USGS.  AZGS is monitoring all the aftershocks with a temporary seismometer network deployed around the main shock area.
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Ho hum, another M3.1 Duncan aftershock

Arizona Geology Blog - Thu, 2014-08-21 02:32
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Record number of downloads of AZGS maps and publications

Arizona Geology Blog - Tue, 2014-08-19 10:34

The AZGS’s online document repository delivered more than 27,500 downloads of geologic maps, open-file reports, bulletins, bulletins, circulars and special papers, all in PDF format, during the fiscal year that ended July 31 . The Document Repository is available free, online at  
Currently, there are more than 1,000 discrete titles available providing more than 1,500 geologic objects – maps, reports, bulletins, and more.  This constitutes almost every publication AZGS and it predecessors have produced in the past 125 years.
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ADWR land subsidence report released

Arizona Geology Blog - Mon, 2014-08-18 02:20
The Arizona Dept. of Water Resources has released its second report on statewide monitoring of land subsidence.

"Land Subsidence Monitoring Report 2" is online for free viewing and downloading. [Right, index maps of active land subsidence areas in Arizona, from the report]

The subsiding basins are all in the Basin and Range province of Arizona, and are those with extensive agriculture or urban development.

Using InSAR and GPS data, "ADWR has identified more than 25 individual land subsidence features in Arizona, collectively covering more than 1,200 square miles of the state."

ADWR has posted 199 land subsidence maps online for downloading.

AZGS contributes funding to the state program.
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M3.1 aftershock from Duncan quake

Arizona Geology Blog - Mon, 2014-08-18 02:09

A magnitude 3.1 earthquake occurred at 9:13 pm on Friday evening, in the aftershock area of the M5.2 Duncan earthquake. [Right, orange star marks epicenter.  Credit USGS]

The main shock was on June 28 and aftershocks are continuing intermittently, with the largest being M4.1.
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Afterschocks continue from Duncan earthquake

Arizona Geology Blog - Wed, 2014-08-13 09:47

The Duncan area of eastern Arizona had another measurable aftershock early this morning, following the June 28, M5.2 event.  A M2.8 quake occurred at 3:33 am local time close to other recent aftershocks.   We expect aftershocks to continue for weeks and possibly months.   [Right, orange star marks epicenter.  Credit, USGS]
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Bill Dresher, first State Geologist of Arizona

Arizona Geology Blog - Mon, 2014-08-11 20:27
We learned late today that Dr. William H. Dresher passed away on August 9.   Bill was named the Dean of the College of Mines and Director of the Arizona Bureau of Mines at the University of Arizona in 1971, and became the first person to hold the title of  “State Geologist." He served as Director and State Geologist until 1981.

In 1977, the Bureau became the Bureau of Geology and Mineral Technology, comprising the geological survey and a mineral technology branch. The Survey was moved out of the University in 1988 to become the Arizona Geological Survey.

Services are scheduled for Thursday, August 14 at 11am with a reception to follow, at Casas Adobes Congregational United Church of Christ, 6801 N. Oracle Rd, Tucson. 520-297-1181.

A short bio is posted on the Camp Miller 2011 Reunion page:

William H. Dresher was born in Philadelphia, Pennsylvania, graduated from Northeast High School and earned a B.S. degree in Chemical Engineering from Drexel University in 1953. He received his Ph.D. in Metallurgy from the University of Utah in 1956. After graduation, he worked for Union Carbide Corporation where, as Assistant Director of Research, he supervised research and development on the extraction and purification of uranium, vanadium, tungsten, molybdenum, and asbestos.

In 1971, he became the Dean of the College of Mines at the University of Arizona, where he increased the College's enrollment and research income, established a degree program in Mineral Economics, and successfully lobbied the Arizona State Legislature for the establishment of a formal state geological survey.

In 1981, He became President of the International Copper Research Association, Inc. (INCRA), supervising product development and providing the leadership that made INCRA an effective organization to promote and defend the use of copper worldwide. In 1989, he became Vice President of Technology of the International Copper Association, Ltd. (ICA). In 1995, he retired from ICA to establish his present consulting practice.

He has represented minerals technology in the National Research Council and was a member of Ronald Reagan's transition team in the field of minerals policy. He is a past president of the Mining and Metallurgical Society of America, a past member of the Board of Directors of the Minerals, Metals, and Materials Society (TMS), and a Distinguished Member of the Society of Mining, Metallurgy, and Exploration (SME). He has been a member of the Mining Foundation of the Southwest since 1971, where he serves on the Board of Directors, and in 1999, served as Chairman of the Hall of Fame Committee. He is currently the chairman of the SciEnTeK-12 Foundation – an organization that encourages young people to enter careers in science and engineering.
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M 3.0 aftershock from Duncan earthquake

Arizona Geology Blog - Sun, 2014-08-10 07:25
We experienced another aftershock to the June 28, M5.2 Duncan earthquake, with a magnitude 3.0 event at 9:39 pm local time Saturday night.   [Right, orange star marks epicenter.  Credit, USGS]

Smaller aftershocks continue to be recorded by the AZGS seismic network but not reported by the USGS.
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HudBay plans new drilling for Rosemont copper deposit

Arizona Geology Blog - Fri, 2014-08-08 16:47
Officials of HudBay Minerals, new owner of Augusta Resources, which is the parent company to Rosemont Copper, were introduced today at the Arizona Mining Alliance monthly luncheon meeting in Tucson.    Over 200 attendees from the regional mining and business communities were present.

Rosemont Vice President Lance Newman announced they will be drilling 85,000 feet of new core holes, all on private land they own within the current open pit boundaries at the proposed mine site. It is in conjunction with an extensive geological and technical review of Rosemont's work to date.     Lance described how HudBay staff are immersed in an in-depth study of many years of data, reports, and studies generated for the project as they get up to speed on all the details of the operation.  He emphasized that HudBay is committed to development of the Rosemont mine as one of their centerpiece operations.   In my interpretation, the new drilling is intended to try to convert inferred resources and reserves to more demonstrated reserve category.    [Right, geologic cross section through proposed pit. Credit, Rosemont Copper]

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Grand Canyon is theme of national Geologic Map Day

Arizona Geology Blog - Thu, 2014-08-07 15:40

The annual Earth Science Week celebration is October 12 – 18 this year, with Friday, October 17 being Geologic Map Day.  The theme this year is “Earth’s Connected Systems.”  

We just learned that the Geologic Map Day team chose the Grand Canyon as the poster for this year.    So, here is a sneak peak of that poster.
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Four earthquakes east of Kingman

Arizona Geology Blog - Mon, 2014-08-04 17:11
We have now recorded signals from four earthquakes last night, east of Kingman, ranging in magnitude from M2.0 to M3.1:

M 3.0 at 8:35 pm local timeM 2.0 at 9:55 pm local timeM 3.1 at 11:57 pm local timeM 2.7 at 12:19 am local timeThe epicenters are about 25-30 miles east of Kingman, and north of highway I-40 Dr. Jeri Young, AZGS geologist who runs our statewide seismic network, relocated the first event that the USGS reported and has added locations for the next two events using data from our Kingman and other stations. [Above.  Red circles mark epicenters] The USGS is currently showing the locations for only the first event.Neither the Sheriff or ADOT report any blasting in the area.  

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Multiple quakes near Kingman?

Arizona Geology Blog - Mon, 2014-08-04 08:24

The USGS reports a M3.0 earthquake at 8:35 pm last night, about 22 miles (36 km) east of Kingman, Arizona.  [Right, orange star marks epicenter.  Red lines are active faults. Credit, USGS]

However, the Kingman seismic monitoring station run by AZGS as part of the Arizona Broadband Seismic Network, shows not only this event but two others [below - time is shown as UTC; local time is 7 hours earlier]

We are assessing whether these are all earthquakes or of some origin, including blasting.

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More aftershocks from Duncan M5.2 earthquake

Arizona Geology Blog - Sat, 2014-08-02 10:07
Two small earthquakes hit the Arizona - New Mexico border area just after midnight this morning, likely aftershocks from the June 28 magnitude 5.2 Duncan earthquake.   A magnitude 2.9 event was followed about 40 minutes later by a magnitude quake.  [Right, orange circles mark epicenters. Credit, USGS]

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Small aftershock from Duncan quake

Arizona Geology Blog - Wed, 2014-07-30 09:11
 A M=2.8 aftershock hit the area of June's M=5.2 Duncan earthquake in southeastern Arizona, just after midnight last night.   This is the largest event in over a week, although we continue to record many smaller shocks.  [Right, orange star marks epicenter.  Credit, USGS]

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Small quake west of Page

Arizona Geology Blog - Mon, 2014-07-28 20:13

A small earthquake, magnitude 2.3, struck 24 miles west of Page, Arizona, at 4:46 pm on Sunday.   [Right, orange star marks epicenter.  Red line is an active fault. Credit, USGS]
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