Magnitude 5 Quebec quake

I was out of town when this one hit near the Canada-U.S. border:

From the USGS:

The June 23, 2010 Val-des-Bois, Quebec earthquake occurred at 1:42 pm local (eastern) time 56 km (35 miles) north of Ottawa, Ontario, Canada's capital city. The preliminary estimate of magnitude (M) is 5.0, at a depth of 16 km (10 miles).

This earthquake occurred near the southern edge of the Western Quebec Seismic Zone. Earthquakes within this zone are mostly small. They tend to cluster in a wide area that is slightly elongated northwest-southeast. Historically, earthquakes in the Western Quebec Seismic Zone have caused damage roughly once a decade. Three or four smaller events each year are felt in the region but are generally too small to cause damage. Still smaller earthquakes are much more common. The largest earthquakes known in this part of Canada occurred in 1935 (M6.1), about 250 km (150 miles) to the northwest of the Val-des-Bois event, and in 1732 (M6.2), about 150 km (100 miles) to the east of the earthquake. The 1732 earthquake caused significant damage in Montreal.

I heard of one Toronto resident who literally felt her bed rolling back and forth. A colleague in Syracuse felt the earth shake as well. This intensity map from the event shows that she was not alone:

Open letter to the President of the Republic of Italy

From the website of the Italian Istituto Nazionale di Geofisica e Volcanologia:

Two weeks ago in Italy, the L’Aquila Prosecutor’s office indicted scientists, some of them members of the “Commissione Grandi Rischi”(Commission for High Risks), and civil protection officials for manslaughter. The basis for the indictment is that these people did not provide a short-term alarm to the population after a meeting of the Commission held in L’Aquila six days before the Mw 6.3 earthquake that struck that city and the surrounding area.

The allegations against the scientists are completely unfounded. Years of research worldwide have shown that there is currently no scientifically accepted method for short-term earthquake prediction that can reliably be used by Civil Protection authorities for rapid and effective emergency actions.

The international seismological community has long recognized that the best approach to defending populations from catastrophic earthquakes is not through earthquake prediction, but through risk mitigation and the application of appropriate safety measures to prevent buildings from collapsing. In this regard, the development of seismic hazard maps, which provide estimates of the probability of occurrence of predefined values of peak ground motion in a given time period, provide the specifications required by building codes to avoid collapse of buildings and the resulting fatalities

Italy is an earthquake-prone country. An improved seismic hazard map that summarizes decades of research on earthquake occurrence and effects was completed in 2004 (see http://zonesismiche.mi.ingv.it/). It is the result of the work of many scientists, it is considered to be one of the best seismic hazard maps in Europe, and it has been used as a basis for the Italian building code beginning in 2008 (“Norme Tecniche per le Costruzioni”, GU n.29 del 04/02/2008). It should be viewed as the primary  contribution of the Italian earthquake scientists to their Country.

Seismic hazard maps must also be used for conveying to the population the basic concepts of earthquake hazard, awareness, preparedness, and response. Increased consciousness of the earthquake hazard and associated risk should also foster further prevention actions by national and local authorities. Overall, earthquake preparedness and damage prevention in the form of retrofitting are not only possible but mandatory in a country affected for the most by moderate size earthquakes that often result in catastrophes for the society because of the large percentage of seismically unreinforced buildings.

Education, awareness, preparedness and retrofitting are the best tools for mitigating the impact of the catastrophic earthquakes that will inevitably affect Italy in the future.

The scientific community involved in earthquake science urges the Italian government, local authorities and decision makers in general, to be proactive in establishing and carrying out local and national programs to support earthquake preparedness and risk mitigation rather than prosecuting scientists for failing to do something they cannot do yet - predict earthquakes.

The President of the Italian Republic is the head of state of Italy and represents national unity. The president's term of office lasts for seven years. The current President of the Republic is Giorgio Napolitano, elected in 2006.

Scientists May Face Manslaughter Charges After Earthquake

American Geophysical Unon Science Policy Alert 10-18:  22 June 2010

Seven Italian scientists and government officials are under investigation on charges of manslaughter for failure to warn the city of L’Aquila, Italy, before an earthquake hit last year, killing hundreds. The scientists and officials under investigation, who are employees of the National Institute for Geophysics and Volcanology (INGV) and the Civil Protection Department, took part in a meeting of the Major Risks Committee on 31 March 2009. At the meeting, the committee told L’Aquila city officials that “just because a small series of quakes has been observed [in L’Aquila] there is no reason to suggest that the sequence of low-magnitude tremors are a precursor to a major event,” which was deemed “improbable, although not impossible.” However, on 6 April 2009, the city was struck by a Mw 6.3 earthquake that killed 308 people.

The criminal charges against these scientists and officials are unfounded.  Despite decades of scientific research in Italy and in the rest of the world, it is not yet possible to accurately and consistently predict the timing, location, and magnitude of earthquakes before they occur. It is thus incorrect to assume that the L’Aquila earthquake should have been predicted. The charges may also harm international efforts to understand natural disasters and mitigate associated risk, because risk of litigation will discourage scientists and officials from advising their government or even working in the field of seismology and seismic risk assessment.

Science is making critical contributions to the understanding and mitigation of earthquake hazards in Italy and the world. Examples include providing tools such as seismic risk maps to determine areas of greatest vulnerability, improving seismic wave analysis so that we can better understand how the Earth moves during an earthquake, and increasing our capabilities for seismic monitoring and for providing rapid information on earthquake location and severity for early warning systems and first responders.

It is in the best interest of all countries to reduce earthquake vulnerability through awareness, preparation, and mitigation. Local government officials should work with scientists and engineers to prepare for seismic hazards in that region. To truly mitigate earthquake risk, governments must utilize the long-term hazard assessment, post-earthquake Shake Maps, and other tools created by seismologists to educate residents and inform sound infrastructure policy. Communities can increase their earthquake preparedness through implementation of building codes based on these long-term hazard assessments, retrofitting older buildings, improving emergency response, and increasing public awareness of the hazard and individual responsibility during and after these tragic events.

In support of the Italian scientists and officials, the INGV has written an open letter to the President of the Republic of Italy. The letter is open for public signatures and, as of 21 June 2010, has 5,028 signatories from around the world, many of whom are geoscientists. Please sign the letter and pass this information on to your colleagues if you support these seven scientists and officials and their right to conduct best scientific practices without risk of persecution.

Seismicity of Azerbaijan

I'll be away in Azerbaijan the next three weeks or so, working at the Oglanqala archaeological site doing magnetometry.

The Azerbaijani National Academy of Sciences Geology Institute says:

Genetically seismicity of Azerbaijan is associated with activity of seismogenic structures in the Lesser Caucasus and in the Greater Caucasus Ridges. In the most territory of Azerbaijan earthquakes of magnitude M=6-6.5 may take place and in some seismogenic structures one can expect seismic events of a maximum magnitude up to M=7. This indicates that on the whole the territory of Azerbaijan and the adjacent part of the Caspian depression have a moderate seismicity. Though for the recent period in the Caucasus region there have not been recorded any seismic events of magnitude M>7-7.2, from the point of view of their peculiar features this region is characterized by a high engineering-geologic risk. This distinguishes the territory of Azerbaijan from the Pacific mobile belt where intensity of earthquakes by Richter's scale is M=8-8.5. 

The English isn't the best, but try learning Azerbaijani!

Figure from ENVSEC

I'll be in the bottom left area of the map, not far from Ararat.

See you in July.

New Jersey quake

A small magnitude 2.3 quake occurred this morning in New Jersey.

Here is the info from LCSN:

MAG    DATE    LOCAL-TIME  LAT     LON    DEPTH    LOCATION
        y/m/d     h:m:s     deg     deg     km

2.3  2010/06/06 04:13:45 40.417N 74.313W  5.0 15 km N of Barnegat

2.3  2010/02/21 12:31:57 40.714N 74.680W  5.0 24 km WSW of Morristown

2.6  2010/02/21 08:59:25 40.717N 74.658W  5.0 22 km WSW of Morristown

1.2  2010/02/06 21:52:48 40.734N 74.658W  2.0 21 km WSW of Morristown

1.5  2010/02/05 05:50:28 40.731N 74.656W  2.0 21 km WSW of Morristown 

2.0  2009/12/26 18:53:13 40.878N 74.550W  6.0 12 km WSW of Boonton

Video report on Dillsburg earthquake

From York Fox News 43:

 

Dillsburg, PA, magnitude 2.9

Dillsburg area shaken by another earthquake

CARL LINDQUIST -- The York Dispatch

Updated: 06/03/2010 10:12:24 AM EDT

An earthquake measuring 2.9 on the Richter Scale struck Northern York County on Thursday morning.

The U.S. Geological Survey reported the earthquake hit the area at 8:25 a.m. Thursday. The Geological Survey said the earthquake was about 3 miles from Wellsville and 4 miles from Dillsburg.

The earthquake that struck Thursday matched the strength of the strongest previous earthquake to hit the area. It occurred in April 2009.

Franklin and Marshall College seismogram

Local geologist Jeri Jones said several people called him Thursday morning to report an earthquake.

One caller told him pictures were knocked off the wall of her home, he said. Another caller said a relative in Mechanicsburg also felt shaking.

York County 911 also reported people calling to report an earthquake. No injuries or damage was reported.

The quake that hit Thursday continues the seismic activity reported in the Dillsburg area, which has been rattled by hundreds of distinct tremors since October 2008. Jones said the last major seismic activity occurred on Oct. 25, when the U.S. Geological Survey reported a series of earthquakes with magnitudes of 1.8, 2.6 and 2.8.