- Tremors follow two plus-4.0 magnitude quakes in state on Saturday
- State geological survey has said wastewater injection could trigger quakes
A series of small earthquakes have been recorded across northern Oklahoma, following two moderate earthquakes in the area on Saturday.
The US Geological Survey (USGS) reported that nine quakes ranging in magnitude from 2.5 to 3.7 were recorded between 5.07pm on Saturday and 5.27am on Sunday. No injuries or damage were reported. Geologists say damage is not likely in quakes below magnitude 4.0.
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Source: Guardian Environment