Quakedle
Puzzle #53 was 20 km E of Castle Rock, Washington.
Quakedle is an educational game. Event details and tsunami indicators must not be used for emergency decisions; follow official local authorities and current USGS notices.
USGS — Tectonic Plates of the Earth
How it scored
- Magnitude
- M3.7 — minor class
- Magnitude type
- ml — local magnitude (the original Richter-style scale)
- Depth
- 17.6 km — shallow
- Region
- Cascadia and the Pacific Northwest
- Tsunami indicator
- USGS tsunami indicator not set
- Felt reports
- 997 DYFI reports
- PAGER alert
- No PAGER alert color reported
- Tectonic plates
- Juan de Fuca Plate · North American Plate
- Tectonic context
- Offshore Cascadia is a subduction margin where the Juan de Fuca Plate descends beneath North America; shallow crustal faults also occur inland.
Also on the record
- USGS reports magnitude M3.7. Which standard descriptive class contains it?
- Minor (below M4.0)
- The hypocentral depth is 17.6 km. Which depth band is it in?
- Shallow (less than 70 km)
- USGS locates the event at “20 km E of Castle Rock, Washington”. Which broad authored region matches?
- Cascadia and the Pacific Northwest
- What does the USGS tsunami indicator say for this event?
- No — USGS did not set the event’s tsunami indicator; that is not a forecast.
- Is this the largest earthquake in the supplied USGS week comparison?
- No — at least one supplied week event has a higher magnitude.