Seismic concerns have led a debate over Rivers School renovations — with similar issues likely to lead to multi-million dollar repairs at other downtown schools. Building Director Bill Lewis told board members last week that he wanted no part of the Rivers rehab project if it didn't include the seismic upgrades. Fortunately for him, several school board members were reading from the same page of dire predictions.
"We have a responsibility," said Charleston County School Board member Gregg Meyers. "I just hope that the earthquake that is inevitable will hold off long enough for us to do it, or come in the summer."
A recent study from Northwestern University seismologists suggests the worries of the school district and others regarding an imminent earthquake in Charleston may be a good 250 years too soon. It's not that the threat is nonexistent — the region was home to one of the largest historical quakes on the East Coast in 1886, killing 60 people and causing about $6 million in damage.
While standard hazard predictions suggest that the next quake could happen at any time, the new study by seismologist Seth Stein and Northwestern senior James Bebden notes existing data does not account for the relatively short time that's passed since the last quake. They argue that the threat for the next few decades is less than half what federal hazard maps currently predict. Under Stein's model, it will take until about 2300 or later before we're at the threat levels that Charleston is currently designing buildings to withstand.
The traditional way to predict earthquake hazards has been to determine where a quake had happened before and the previous magnitude, and then plot out just how bad the next one will be. Under that model Charleston is just as likely to have an earthquake tomorrow as Reno or St. Louis, where quakes have shaken residents in the last few weeks. But Stein argues that earthquakes are not only dependent on where earthquakes have happened in the past, but also how long it's been since that last one.
"In general, (seismologists) tell you that some places are overdue for an earthquake," Stein says. "Like parts of the San Andreas fault — we're amazed it hasn't happened yet. That implicitly means that we believe the world is building up for an earthquake."
If the stress has to build before the next quake, Charleston (which has an estimated cycle of about 550 years) is far less likely to see an earthquake today than it is hundreds of years from now.
"When we make a seismic hazard map, we take the opposite view," Stein says. "It's treating earthquakes like hurricanes. Three weeks after the first one, you could have another."
State building code standards use these time-independent federal hazard maps to determine how stringent guidelines should be, but Stein argues the existing threat level in Charleston is about 56 percent less than those estimates currently used.
Even if the state requirements were modified, construction on many peninsula buildings would not be affected because of more stringent hurricane protection standards, says Tom Scholtens, chief building codes official for the city.
"Typically, the wind load is greater than the expected seismic loads for our buildings," he says. "The only buildings that would typically see the lateral seismic considerations govern are larger buildings that are taller or oddly shaped, or those more closely located to the north of I-526."
The school district's debate over seismic upgrades at the Rivers School raises the question of whether a building should be upgraded for seismic protection if, according to Stein's model, the structure will likely never face those threats.
Organizers of the Charleston Charter School for Math and Science, which is expected to move in after repairs are complete, had hoped to keep costs at just over $10 million — which the district had already budgeted for. But district officials have come back with at least $17 million in additional electrical, utility, and structural improvements.
Topping that list is more than $4 million in seismic improvements that include reinforcing walls and restraining utility lines and suspended ceilings, as well as installing earthquake joints for the L-shaped building to survive a quake. The district currently has no funding source for the additional work, which could potentially push the completion date for the project out another three years.
District staff want to make it a priority to upgrade all the district schools at risk for seismic impacts, including Memminger, Buist, and James K. Simmons, with Rivers first because the property will be going through renovations anyway. But Math and Science organizers, who say they've fought opposition from the district for two years now, say the seismic work and the other improvements are the latest — and possibly last — attempt to keep the parent-controlled school out of the district-owned property.
"They've effectively condemned the building," says Park Dougherty, a Math and Science organizer. "It's all a blocking maneuver."
Local building codes would not require the seismic improvements, Dougherty says.
District staff never asked architecture firm Davis and Floyd whether the improvements were required, Lewis says. Instead, they wanted to know what would happen in a major earthquake and the firm found the building would collapse. Even allowing for a lighter earthquake, it still predicted substantial injuries.
Even if local officials wouldn't require the seismic work, Lewis says more stringent state standards for schools negates the argument. He also points to a 1998 paper done by Citadel professor Charles Lindbergh that paints a bleak picture for Charleston schools if an earthquake strikes. The study predicted more than 1,000 fatalities in schools in the Charleston-Berkeley-Dorchester region, with 659 from Charleston schools. And it's hard to argue with those numbers when the same logic that birthed them — those doom- and-gloom hazard maps — continue to apply today.
Considering school buildings are designed with a 50-year shelf life, the existing Rivers building will have long been replaced by the time an earthquake hits, according to Stein's model.
The time-dependent theory has received some traction. The U.S. Geological Survey, which has recently begun developing additional time-dependent models in California, noted last month that these new models "are a reasonable basis for the earthquake-resistant provisions in building codes and long-term mitigation strategies."
But any attempt to replace the existing hazard maps is likely to face heated debate, if not out-and-out opposition.
"If all the newly constructed buildings withstand the (next) event, does that mean we were excessive in our requirements?" Sholtens asks. "Is the test for a success in our codes seeing the building collapse or seeing a building resist the actual forces? If the buildings are expected to endure, a margin of safety must be built into our code requirements to be built into our buildings. It is not prudent to build them just good enough."
Stein agrees that you've got to do better than "good enough," but thinks his time-dependent model should be used to find a new, lower median for Charleston.
"It says that standards people have been calling for are too high," he says. "One should neither overreact to the problem nor ignore it. To me, there's no question that some are overreacting right now."
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Bill Lewis is motivated by two separate but related agendas. The advancement and success of both are dependent on the use of a certain degree of fear mongering.
One motivation is how to make more work for himself and his friends, whether it is needed or not. The other driving force is to obstruct, block and generally make unavailable as much as possible any school property that might be utilized by a public school not directly under the authority of the central office. In other words, block the progress of charter schools at all costs.
The public and trained engineers both need to watch for CCSD's slight of hand as this debate progresses. A few questions should be asked if only as a reality check.
Is it realistic, or even required, that a school building be rendered 'earthquake proof'? If the objective is to save lives, then it would seem that 'earthquake resistant' is all that is required in order to allow for the quick and safe evacuation of a structure should such an event occur within the remaining life expectancy of the building.
Why is it that CCSD lists virtually all the downtown schools as in eminent danger of collapse, when quite a few older and lesser quality mult-story buildings exist throughout the county? Does the agenda not yet being discussed also include prohibitive cost estimates and resulting calls for the abandonment of downtown schools altogether? Who stands to profit most if a course of downtown school closure, abandonment and property sale is followed?
Thanks to Mr. Ravenel for bringing information forward about structural remediation which can provide a far more logical and less expensive middle course. It doesn't have to be all or nothing to protect our schools against a 500 year event in a city where the average "historic" public building is not much more than 150 years old and is also proof that older buildings have survived a major earthquake. Incidentally, Memminger High School, a four story unreinforced masonry school building survived the earthquake of 1886 without major damage.
Please note a couple of factual corrections. Schools built after 1945 generally have been assigned a 50 year shelf life because they were built to the specifications of cost manual that rate the effective age of a building between 30 and 50 years, depending upon its originally designed class or quality. Public buildings constructed prior to 1940, though built to contemporary code standards, were often over-built when compared to modern standards. By some estimates, these structures could be described as having a 100-year shelf life. By example, how does the slate roof on Rivers compare to the flat composite roof on West Ashley or Wando? The latter roofs are less than 10 years old and are already leaking. The former is nearly 75 years old and is relatively dry, except for what has resulted from poor or deferred maintenance at the direction of the department headed by Mr. Lewis.
Finally, James Simons is spelled with one "m" not two.
1) The 60 deaths mentioned in the story was from the US Geological Survey. 2) The story doesn't suggest that the next earthquake will happen anywhere else but where it happened before. 3) AND 4) Well, that debate is the entire reason for the story.
The article ("New Study: Charleston overreacting...") contains glaring errors of fact and assumptions about earthquakes in the Charleston area and the hazards they present today. The most up-to-date information on South Carolina's earthquake history and hazards can be found at www.scearthquakes.com. Charleston needs far more leaders like Building Director Bill Lewis, who told school board members that “he wanted no part of the Rivers [School] rehab project if it didn’t include seismic upgrades.” It’s this kind of man who is keeping South Carolina’s children from being killed by the hundreds—and perhaps thousands—in the next local earthquake disaster. In addition, there is no man or woman in South Carolina who knows the earthquake damage potential to Charleston-area buildings than Carl H. Simmons, Charleston County's Director of Building Inspections. He stated that the repairs of buildings built before the 1886 earthquakes were often done to shoddy to the point of criminally negligent standards, and that post-1886 "new" buildings were no better built than the ones that collapsed during the earthquake. 1. The 1886 Death Toll. In this article, the death toll for the 1886 earthquake was misstated as "60 people." This statistic has been wrong since the fall of 1886, when the city listed 83 earthquake-specific fatalities in its official city death record. Recent research, published in my book, "City of Heroes: The Great Charleston Earthquake of 1886," positively documented at least 124 deaths and over 140 serious injuries. There were more which went unrecorded. 2. Where will the next "Big One" (catastrophic, 1886-grade, Magnitude 7.3 +/- event) happen in SC? That is known to every geologist who has ever studied South Carolina earthquakes. It will likely happen along the Woodstock Fault, which runs through the center of the Middleton Place-Summerville Seismic Zone (MPSSZ), which generates 8-12 NEW earthquakes every year. The latest example was a small (Magnitude 2.4) earthquake beneath Hanahan on October 13, 2007. Over 2,000 new earthquakes have originated in the MPSSZ since 1886. "Where" earthquakes will strike next is an easy call for geologists: they will strike in exactly the same places as the last ones did. The reason is simple: unlike hurricanes, which have a different track each time, earthquake fault zones don't move. The next ones will come from the exact same places as the last ones. 3. When will the “Next Big One” Strike” We know the average time between catastrophic earthquakes the Charleston area is between 500 to 550 years – but this tells us nothing about when the next big one will strike. Earthquakes strike when the pressure along a fault line builds up to a certain level, and is then discharged in a burst of energy called an earthquake. But earthquakes do not run on a countdown clock. The next “big one” here may not happen for 1,000 years – or it may happen tomorrow afternoon. We must be ready NOW. 4. How bad will the next “big one” be here? Catastrophic almost beyond imagination – and this is not just alarmist theory. All of South Carolina, and about a third of North Carolina and George will suffer structural damage – just as in 1886. A 2001 FEMA / SCEMD computer simulation of a repeat of the 1886 earthquake IN THE Charleston area during daylight hours produced these chilling and reliable predictions (view the whole report at www.scearthquakes.com): • Vastly greater destruction of life and property. This is due to the enormous population growth since 1886 and the lack of earthquake-resistant building construction standards until the last few years. • At least 900 fatalities, compared to 124 known deaths in 1886. • At least 8,000 serious injuries, compared to 140 known serious injuries in 1886. • Approximately 45,000 total casualties (dead and injured), compared to approximately 500 in 1886. • More than 200,000 people displaced, with 60,000 requiring short-term (under 90 days) shelter, compared to 40,000 in 1886. • At least $200 billion in total economic losses from damage to buildings, interruption of businesses, and damage to transportation and utility systems, compared to approximately $100 million in 2006 dollars in 1886. About 77 percent of the losses will occur in the Charleston-Berkeley-Dorchester region. • More than 250 fires, compared to eight in 1886. The lack of operational firefighting equipment and a supply of water to fight the fires will be major concerns—just as in 1886. • Significant damage to more than 200 schools and over 100 fire stations. Because of insufficient seismic building code standards and the age of the majority of buildings, the majority of structures in the State, specifically schools and fire stations, are vulnerable to damage. The catastrophic failure or partial collapse of one or more school buildings during a school day could greatly increase casualties. • About 20 out of 108 hospitals will be incapacitated, mostly within the tri-county area, where most of the casualties will occur. • About 800 bridges will be rendered unusable, thereby preventing first responders who try to reach victims. South Carolina is one of the four most earthquake-active states in the nation. We must pay close attention to the clear and present dangers — or risk the deaths of thousands of innocent people who could have been saved. Richard N. Côté, President South Carolina Earthquake Awareness Association Author of City of Heroes: The Great Charleston Earthquake of 1886 Webmaster of www.scearthquakes.com (843) 881-6080 dickcote@earthlink.net
Science cannot predict when or where an earthquake will happen. Put simply, the science is still in its infancy. Look at their statement about the San Andreas fault. They are "amazed" that the big one hasn't hit yet. To me this is evidence that they do not yet understand why earthquakes occur. (Yes...we all know its because of shifting tectonic plates, but how and why they move is still yet to be known) To say that Charleston is due for a quake in the next 250 years is the same thing as saying "we have no blind clue when this is going to happen" But rest assured that it IS going to happen sometime. That said... If we were to build quake resistant buildings we will never say in the future "I wish we had not built that building so strong" Seems like common sense to build strong and build well.... Especially for a school.
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