Landslides are more likely in the event of an earthquake or heavy rainstorm, but they can occur anytime, and are extremely destructive to property. The irregular shaped areas filled with triangles are zones where landslides have happened, leaving behind deposits. Hint: It’s easier to see these areas if you uncheck the “Earthquake Hazards” box in the Layers panel. The orange-red shading on the map indicates the intensity of shaking most of Portland would experience Very Strong to Severe effects if either one of these earthquakes were to happen! Using the Layers panel, users can toggle between a Cascadia Subduction Zone earthquake, or a Portland Hills Fault earthquake. The intensity of the two earthquakes most likely to hit Portland in the near future.This map shows two major types of information: To learn about earthquakes that can (and will, eventually) happen in Portland – as well as other geologic hazards like landslides – our real estate agents turn to the Portland Geologic Hazards Map, created by the city’s Bureau of Planning and Sustainability. This includes surface faulting, ground shaking, landslide, liquefaction, tectonic deformation, tsunamis, and seiches. According to USGS, “ Earthquake hazard is anything associated with an earthquake that may affect the normal activities of people. The Latest Earthquakes map and Faults maps are interesting, but they don’t actually show what the hazard is for an earthquake occurring in any given area. And yes, while that Portland fault is technically an active one, geologic time offers some comfort here: An active fault is one that has had movement in the past 10,000 years. Zoom in on Portland to see the fault line that runs from Lake Oswego to Northwest Portland! Quaternary Faults are those that appeared less than 1.6 million years ago - recently, in geologic time. From a distance, California appears to be one solid fault line, but Oregon has a few, too. This map shows where earthquakes are likely to occur around the world. In fact, Portland lies just at the edge of the Pacific rim, a very lively earthquake zone. Beyond that, and there would be too much data for most home computers to display! It’s a good reminder that earthquakes are happening all the time, around the world. The map can show a history of all earthquakes for the past thirty days. Earthquakes appear as dots on the map the colors indicate how long ago they happened. (Click the header links to go to the earthquake maps.) For those fascinated by seismic activity, this live US Geological Survey map provides up-to-the-minute information about earthquakes happening around the globe. The Top 5 Portland Earthquake Maps of 2020 1.
Take a look at these Portland maps before you buy a home. Maps can also help us be better prepared for disasters by showing were resources and hazards are.
Yes, there is a certain amount of earthquake risk in Portland, but the good news is that geologists are getting better and better at understanding, mapping and even predicting seismic activity.
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