Geologic Hazards. Montour County Multi-jurisdictional. General. Earthquake
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1 Geologic Hazards General s are very rare in Pennsylvania and have caused little damage with no reported injuries or causalities. s that do occur in Pennsylvania happen deep within the Earth s crust. This is because the Commonwealth does not lie on an active fault. In most cases, these earthquakes are non-measurable events. Nonetheless, earthquake standards are a valuable consideration when determining building codes. The Richter Scale below describes the magnitude of earthquakes. The Richter Scale Descriptor Richter Magnitude Effects Worldwide Annual Average Micro Less than 2.0 Microearthquakes, not felt. About 8,000/day Very Minor Generally not felt, but recorded. About 1,000/day Minor Often felt, but rarely cause damage 49,000 (estimated) Light Noticeable shaking of indoor items, rattling noises. Significant damage unlikely. Moderate Can cause major damage to poorly constructed buildings over small regions. At most slight damage to well-designed buildings. Strong Can be destructive in areas up to about 100 miles across in populated areas. Major Can cause serious damage over larger areas. Great 8.0 or greater Can cause serious damage in areas several hundred miles across Source: U.S. Geological Survey (USGS) 6,200 (estimated) are a natural movement of the earth down a slope. While there have been no recorded deaths or injuries from landslides in Pennsylvania, this does not mean they cannot occur. The worst damage caused by landslides usually affects utilities, pipelines, roadways, and buildings March 2007 C-1 DRAFT
2 is a naturally occurring, colorless, odorless, inert, radioactive gas. It forms as a product of the natural decay of uranium. and its radioactive products are dangerous to health. Alpha particles are a probable cause of lung cancer. Studies done in Pennsylvania since 1984 show that indoor radon levels are controlled by the radonemanation properties of soil and rock on which the home is built. Subsidence is caused by the removal of ground water or other resources from the ground. Sinkholes are a natural hazard caused by erosion underground. The difference between subsidence and sinkholes is that subsidence is a manmade hazard, while sinkholes are naturally occurring. The United State Geological Survey states that sinkholes are a characteristic of karst topography that results from dissolution and collapse of carbonate rock, such as limestone and dolomite. It is characterized by closed depressions or sinkholes, caves, and underground drainage. History No significant earthquakes have been recorded in Montour County. Parts of southeastern Pennsylvania, such as Lebanon and Berks Counties have experienced minor earthquakes with minimal damage. Landslide history is not as well documented as other hazards, primarily because landslides are not always seen. have occurred all over Pennsylvania and have caused minor to major damage. While no significant landslides have been documented in Montour County, landslides are a considerable geologic hazard that can occur in any area if local conditions are right. The Pennsylvania Department of Transportation estimates it spends $10 million annually on repair contracts for roadways damaged by landslides throughout the Commonwealth. Pennsylvania has a serious radon problem. While individual instances of radon are not well documented, Pennsylvania has seen numerous cases of radon in homes. It is estimated that 40 percent of homes in Pennsylvania have radon levels above EPA s action guideline of 4 pci/l. One pci is equal to the decay of about two radioactive atoms per minute. March 2007 C-2 DRAFT
3 Sinkholes are a problem throughout Pennsylvania. The United States Geological Survey states that sinkholes have been most dangerous and frequent in Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania. While the U.S. Geological Survey has no recorded sinkholes in Montour County, this does not mean one does not exist. Montour County s volumes of limestone rock make it susceptible to sinkholes. March 2007 C-3 DRAFT
4 Vulnerability As seen in the Zones map located to the right, Montour County is at a slight risk to experience an earthquake. However, no earthquakes have been documented in County history. S Source: Millersville University Geography Dept. The total number of landslides and their damage in Pennsylvania is unknown. Reporting of landsides varies widely from county to county. are most often seen in Allegheny, Armstrong, Beaver, Tioga, and Washington Counties. Most landslides occur as a result of heavy precipitation. Also contributing to this is the removal of vegetation, changing the slope of a hillside, and earthquakes. As seen on the landside overview map below, most of Montour County has a low level of landslide incidents, while the southern most portion of the County has high susceptibility with a moderate rate of incidence. March 2007 C-4 DRAFT
5 According to the U.S. Environmental Protection Agency, Montour County is among the Pennsylvania counties with the highest potential for dangerous radon emission. This is illustrated in the Pennsylvania Zones map here. It is important to remember that no individual location can be assumed safe unless proven so by testing. The map below illustrates the average radon levels for the zip codes of Montour County, measured by the Pennsylvania Department of Environmental Protection. The EPA recommends that you take action to reduce your home indoor radon levels if your test is 4pCi/L (pico Curies per liter) or higher. Montour County Zones Source: PA Department of Environmental Protection Subsidence and sinkholes strongly correlate to the distribution of carbonic rock. However, not all areas underlain by carbonate bedrock, such as limestone, are at risk. According to the PA Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey, no sinkholes exist in Montour County. Yet, because of the limestone rock formations located in Montour County, there is still the possibility that subsidence or a sinkhole could occur. March 2007 C-5 DRAFT
6 Probability The probability of an earthquake affecting Montour County is extremely low, with a probability of occurrence greater than 30 years. While Montour County does not lie on a major fault line, it is still possible the County could experience minor, unrecorded quakes with minimal-to-no damage. There is a relatively low probability that a landslide will significantly affect Montour County. History shows a frequency of occurrence every 30 years or less. While susceptibility and probability may be low in Montour County, minor landslides resulting in little-to-no damage may occur more frequently. gas is emitted from underground decaying uranium. Montour County is located in an area with the highest potential for radon emission in Pennsylvania. Therefore, there is great potential for radon emission in Montour County. No area should be assumed safe until tests have proven so. The potential for subsidence or sinkholes to occur in Montour County is relatively low. Often, these events occur every 30 years or less with a low impact. There is even less potential for a severe event. Maximum Threat Because Montour County does not rest on a major fault, no single area is at greater risk of an earthquake than another. The threat of landslides is greatest along high-volume traffic areas, especially where the road travels through a cut in the topography. Therefore, Interstate 80 (I-80), principal arterial U.S. Route 11, and major collectors such as State Routes 44, 54, 254, and 642 face the greatest risk associated with a severe landslide. All Montour County municipalities face a high potential for radon gas emission. Only areas that have been tested and found safe can be assumed to not be susceptible to the effects of radon gas emission. March 2007 C-6 DRAFT
7 The entire County is susceptible to sinkholes, due to its geological makeup. Maximum threat would occur in areas that are underlain with carbonic rock, such as limestone. Limestone is found throughout most of Montour County. Secondary Effects The secondary effects of an earthquake can range from nominal to severe, based on its location and magnitude. Even minor quakes have the potential to cause power outages, hazardous material spills, dam failures, traffic accidents, and landslides. The economic impact from widespread structural damage to property, facilities, and infrastructure can also be severe. The health and safety of citizens and essential personnel in the affected area can be adversely affected. A limited disruption of critical government services may occur. Similar to earthquakes, the secondary effects from a landslide can cause traffic disruptions and accidents. These events can also lead to power outages and hazardous material spills. Often, radon goes undetected and unnoticed. Because of this, the secondary effects are more difficult to identify and track. However, radon is known to have adverse short and long-term effects on the health and safety of persons affected, and is widely believed to be a probable cause of lung cancer. Sinkholes occur without warning and can damage critical infrastructure, such as road networks, and can cause traffic disruption, accidents, and pipeline breaks. Accidents and pipeline breaks can introduce hazardous materials in to the affected area. However, most subsidence and sinkholes occur in remote rural areas and result in few secondary effects. The financial cost of repairs are usually minimal. March 2007 C-7 DRAFT
The Richter Scale. Micro Less than 2.0 Microearthquakes, not felt. About 8,000/day
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