Sites with shallow bedrock outside the Seattle basin have the lowest estimated hazard for this frequency band. QCN Explorer allows users to simulate how the QCN responds to an earthquake with a larger number of sensors. The goal of this project is to educate people about seismology and increase the awareness of QCN.
#3d earthquake site simulator#
In general, stiff-soil sites in the Seattle basin exhibit higher hazard than stiff-soil sites outside the basin. Welcome to QCN Explorer QCN Explorer is a simulator of the Quake Catcher Network, a volunteer computing project out of Stanford University. The next highest hazard is typically found for soft-soil sites in the Duwamish Valley south of the Seattle basin. The maps show that the most hazardous locations for this frequency band (around 1 Hz) are soft-soil sites (fill and alluvium) within the Seattle basin and along the inferred trace of the frontal fault of the Seattle fault zone. The maps are based on determinations of seismic hazard for 7236 sites with a spacing of 280 m. The probabilistic seismic hazard maps presented here depict 1 Hz response spectral accelerations with 10%, 5%, and 2% probabilities of exceedance in 50 years. The 3D velocity model utilized in the simulations was validated by modeling the amplitudes and waveforms of observed seismograms from five earthquakes in the region, including the 2001 M6.8 Nisqually earthquake. The maps presented in this document used essentially the same set of faults and distributed-earthquake sources as in the 2002 national seismic hazard maps.
![3d earthquake site 3d earthquake site](https://d3i71xaburhd42.cloudfront.net/49cc5ce018b851bd4bc1c1e126ad708733b7996c/3-Table1-1.png)
3D simulations were conducted for the various earthquake sources that can affect Seattle: Seattle fault zone, Cascadia subduction zone, South Whidbey Island fault, and background shallow and deep earthquakes. The report describes the methodology for incorporating source and site dependent amplification factors into a probabilistic seismic hazard calculation.
![3d earthquake site 3d earthquake site](https://c1.staticflickr.com/5/4041/4529368786_ff7f177849_b.jpg)
Nonlinear site response for soft-soil sites of fill and alluvium was also applied in the maps. These maps include 3D sedimentary basin effects and rupture directivity. This report presents probabilistic seismic hazard maps for Seattle, Washington, based on over 500 3D simulations of ground motions from scenario earthquakes.