A5031953895- Insurance and Financial Risk Management
- Flood Risk Assessment and Management
- Tropical and Extratropical Cyclones Research
- earthquake and tectonic studies
- Disaster Management and Resilience
- Seismology and Earthquake Studies
- Insurance, Mortality, Demography, Risk Management
- Agricultural risk and resilience
- Risk and Portfolio Optimization
- Seismic Performance and Analysis
- Wind and Air Flow Studies
- Structural Health Monitoring Techniques
- Control Systems and Identification
- Earthquake Detection and Analysis
- Meteorological Phenomena and Simulations
- Infrastructure Resilience and Vulnerability Analysis
- Climate change impacts on agriculture
- Coastal wetland ecosystem dynamics
- Risk Perception and Management
- Seismic Waves and Analysis
- Advanced Multi-Objective Optimization Algorithms
- Hydrology and Drought Analysis
- Advanced Vision and Imaging
- Soil Geostatistics and Mapping
- Climate variability and models
Williams & Associates
2019
Columbia University
2004-2010
Karlsruhe Institute of Technology
2010
AIR Worldwide (United States)
2010
Western Washington University
2010
Earth Island Institute
2004-2006
As exposure to coastal hazards increases there is growing interest in nature-based solutions for risk reduction. This study uses high-resolution flood and loss models quantify the impacts of wetlands northeastern USA on (i) regional damages by Hurricane Sandy (ii) local annual losses Barnegat Bay Ocean County, New Jersey. Using an extensive database property exposure, shows that avoided $625 Million direct during Sandy. The combines these with a synthetic storms County estimates 16% average...
In the wake of 1999 earthquake destruction in Turkey, urgent need has arisen to evaluate benefits loss mitigation measures that could be undertaken strengthen existing housing stock. this study, a benefit-cost analysis methodology is introduced for comparative evaluation several seismic retrofitting applied representative apartment building located Istanbul. The performed probabilistically through development fragility curves structure its different retrofitted configurations. By...
The problem of system identification is an inverse difficult solution. Currently, difficulties lie in the development algorithms that use measured data from to characterize it without significant a priori knowledge system. In this paper, parameter estimation technique based on evolution strategy (an optimization algorithm inspired by natural evolution) presented overcome some encountered field. Using method, set direct problems solved instead directly tackling problem. If uniqueness solution...
The 25th April 2015 M7.6 Gorkha earthquake caused significant damage to buildings and infrastructure in both Kathmandu surrounding areas as well triggering numerous, large landslides. This resulted the loss of approximately 8600 lives. In order learn how impact such events can be reduced on communities Nepal elsewhere, Earthquake Engineering Field Investigation Team (EEFIT) reconnaissance mission was undertaken, aiming look at patterns within country. Passive, microtremor recordings severely...
Catastrophe bonds are used by the insurance and reinsurance industry national governments to cede catastrophic risks financial markets. Triggers whose outcomes depend only on earthquake parameter data published respected third parties can be implemented determine without moral hazard whether bond principal is paid for a certain event. Sensitivity analyses different design assumptions show that these transactions often affected trigger error, unless sufficiently dense geographic...
The Chilean earthquake and tsunami disaster of 27 February 2010 impacted 12 million people in 900 cities towns, causing more than US$30 billion losses. This paper considers how the national government responded to challenges coastal urban reconstruction, examines actions taken housing, land use mitigation planning, insurance, risk reduction management sectors. utilized a mixed decentralized model for recovery with strong direction from national-level ministries subnational planning housing...
This paper presents the observations during EEFIT's post-earthquake reconnaissance missions to September 20, 2009 Padang (Mw7.6), March 11, 2011 Tōhoku (Mw9.0) and April 16, 2016 Muisne (Mw7.8) earthquakes. The performance of buildings geotechnical structures within affected regions were investigated gain insights on their design construction deficiencies. Findings these damage observed are compared along with characteristics earthquake nature building codes in countries. They include caused...
This work tackles the problem of global identifiability an undamped, shear-type, N degrees freedom linear structural system under forced excitation without any prior knowledge its mass or stiffness distributions. Three actuator/sensor schemes are presented, which guarantee existence only one solution for and identification while requiring a minimum amount instrumentation (only 1 actuator 2 sensors). Through counterexample 3DOF it is also shown that fewer measurements than those suggested...
The 26 December 2004 tsunami displaced more than 500,000 people and killed an estimated 31,000 in Sri Lanka. Damage was not uniform, often reflecting distinct patterns of social, infrastructural, ecological vulnerability. Severely affected populations tended to be poorer, live fragile structures, exposed the as a result prior environmental degradation coastal zone. massive reconstruction effort may further decrease resilience rural communities by degrading natural environment that sustains...
Hurricane Katrina and the subsequent flood caused by failure of levee system had a severe impact on low- middle-income neighborhoods in city New Orleans. This paper presents damage survey data collected Orleans East, Lower Ninth, Upper Ninth during series field reconnaissance activities that spanned period November 2005 to April 2006. A total 82 residential buildings were surveyed for structural nonstructural damage. Detailed observations different building components are presented along...
The insurance industry has used parametric solutions to transfer catastrophe risks since the 1990s. Instead of relying on a lengthy process assess claim, these products pay insured pre-agreed amount if physical characteristics event fulfill pre-defined conditions. Cat-in-a-box or cat-in-a-circle triggers, commonly tools for tropical cyclone risk transfer, provide payout track hurricane crosses perimeter geographic area defined by polygon circle with certain intensity. Cat-in-a-grid are novel...
This study presents a calibration of CAT-in-a-Box and intensity-based index trigger mechanisms for parametric tsunami catastrophe bonds. Trigger conditions the former are based on fundamental event characteristics, such as earthquake location magnitude, whereas those latter utilize wave height measurements at series observation stations. These solutions illustrated building portfolio in Iwanuma City Miyagi Prefecture, Japan, by considering new seafloor network S-net off Tohoku-Hokkaido coast...
On February 27, 2010, an earthquake of momentmagnitude 8.8 struck the central Pacific coast Chile, triggering a tsunami and causing severe shaking along nearly 600 km coastline from Viña del Mar in north to Concepción beyond south. This disaster tested country’s government management capacity as well its built environment. Despite large amount energy released this event area affected, actual impacts were limited terms severity geographic dispersion loss life. A set observations on impact,...
Parametric catastrophe (CAT) bonds are financial derivatives that provide a capital influx after large natural disaster. More than US$10 billion in earthquake risk has been transacted since the late 1990s using mathematical relationships between monetary loss and ground accelerations recorded by seismological instruments. This paper investigates how quality of these varies depending on functional forms used geographic distributions both strong motion sensor network exposure assets for which...