Nature's extreme events provide immediate lessons
April 3, 2014
When the Canterbury earthquake of 2010-11 struck in the Christchurch area of New Zealand, wide spread liquefaction occurred, allowing the soil to behave more like a liquid. As a result of tectonic movements and subsidence due to this liquefaction, large portions of Christchurch became susceptible to flooding.
So, when in early March of this year, as heavy rains fell in this same area, and were described by the town's mayor as a one in a 100 year event, further destruction wreaked new havoc on this largest city in the South Island of New Zealand.
As a result, the U.S. based National Science Foundation is supporting a team of experts, including Nina Stark, assistant professor of civil and environmental engineering at Virginia Tech, to investigate the impacts of this most recent flooding, labeled by professionals in the geotechnical community as an extreme event.
Stark and the other members of the team were selected by the Geotechnical Extreme Events Reconnaissance Association. This association attempts to collect data immediately after an extreme event such as an earthquake, a tsunami, or a flood.
According to a GEER press release, the team will focus on understanding how a large liquefaction event impacts the damaging effects of another extreme event that follows it. The team will be focusing in critical infrastructure performance such as sewer and water networks, foundations of critical structures, levee networks, and other lifelines.
Stark was in New Zealand gathering information from March 17-21.
GEER assembled this multidisciplinary team to investigate the wide range of hazardous aspects of the recent Christchurch flood event. John Allen, a professional engineer at TRI Environmental Inc., is leading the GEER team. Co-Leader is Sonia Giovinazzi, research fellow at the University of Canterbury. Joining them are Craig Davis, of the Department of Water and Power for the city of Los Angeles; Laurie Johnson of Laurie Johnson Consulting; William Siembieda of California Polytechnic of San Luis Obispo; Rebecca Teasley of the University of Minnesota Duluth; and Stark.
The U.S. GEER team will be working closely with New Zealand engineers and scientists to document the effects of this flood event that may have been affected by the 2010-11 Canterbury earthquake sequence.
Stark joined the Virginia Tech faculty in the fall of 2013 from a postdoctoral fellow position she held since 2012 at the Dalhousie University's Department of Oceanography in Halifax, Canada.
From 2007 until 2010, Stark was a research assistant at the MARUM Center for Marine and Environmental Science. During that time she participated in some 20 research cruises and field experiments in the North Sea, Baltic Sea, Northern and Southern areas of the Pacific Ocean, and in different lakes in New Zealand. In 2011 she became a postdoctoral fellow with the university.
Stark earned her master's degree in geophysics from the Department of Physics at Westphalian Wilhelms University of Muenster, Germany in 2007. She also minored in the physics of solids and surfaces, mineralogy, and inorganic chemistry. She obtained her doctorate in marine geotechnics at the MARUM Center for Marine and Environmental Sciences at the University of Bremen, Germany in 2011.