Brainstorm: How to assess an Earthquake: Stroked off B.C. coast? Rapid Earthquake Risk Assessment Source Parameters USGS World Shake Maps USGS Shake Aftershocks IRIS Seismic Monitor Slip/Stress Model CALTEC

Outline Earthquake Magnitude – Types of magnitude Earthquake Depth – How deep it is? Type of faulting – Vertical – Lateral Fault Interaction – Fault neighbourhood

Outline First, we need to understand the size of an earthquake, which is given in different types of magnitude, e.g. surface wave magnitude or body wave magnitude. The most accurate magnitude for an earthquake is moment magnitude that based on the calculation of rupture length and fault slip. – Types of magnitude Earthquake Depth – How deep it is? Type of faulting – Vertical – Lateral Fault Interaction – Fault neighbourhood

How to assess earthquake risk? Ali Oncel I am motivated to write up on possible ways to perform a quick assessment of an earthquake and possible risk since a larger earthquake of M6.5 occurred in west coast of Canada today. First, we need to understand the size of an earthquake, which is defined, based on the types of earthquake waves, e.g. surface wave magnitude or body wave magnitude, but moment magnitude solution is critical to explain an earthquake since it based on more physical parameters such as rupture length and fault slip. Secondly, we have to look at the earthquake depth to estimate how it would cause a risk, because shallow depth earthquake cause more damage. For example, most earthquakes in Japan are larger in magnitude, but they do not cause damage since they are deeper more than 40 km. Next step, we need to assess the type of faulting, because it shows a mechanism of the earthquake which is critical to estimate apparent stress distribution. Finally, we need to understand possibility of earthquake interaction or fault coupling by examining the pre-existence faults around the earthquake.