Quakedle
Puzzle #71 was 180 km NW of Hihifo, Tonga.
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
- M5.7 — moderate class
- Magnitude type
- mww — W-phase moment magnitude
- Depth
- 10.0 km — shallow
- Region
- Tonga, Fiji, and the Kermadecs
- Tsunami indicator
- USGS tsunami indicator not set
- Felt reports
- No DYFI count reported
- PAGER alert
- green PAGER alert
- Tectonic plates
- Pacific Plate · Australian Plate
- Tectonic context
- The Tonga–Kermadec trench is a fast subduction system where the Pacific Plate descends beneath the Australian Plate region.
Also on the record
- USGS reports magnitude M5.7. Which standard descriptive class contains it?
- Moderate (M5.0–5.9)
- The hypocentral depth is 10.0 km. Which depth band is it in?
- Shallow (less than 70 km)
- USGS locates the event at “180 km NW of Hihifo, Tonga”. Which broad authored region matches?
- Tonga, Fiji, and the Kermadecs
- 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.
- The event uses magnitude type “mww”. What does that code mean?
- Mww — W-phase moment magnitude