According to the USGS, about 103 000 people are estimated to have felt light shaking and 640 000 weak. The agency issued a Green alert for shaking-related fatalities and economic losses.
High Plains Observer reported the quake was felt in Amarillo, Oklahoma City, and Tulsa. No damage or injuries had been reported.
Earthquakes of this magnitude are rare in the Texas Panhandle. The National Weather Service (NWS) office in Amarillo said nearly 91% of known regional earthquakes since 1907 were below M5.0.
The NWS chronology through 2011 lists three earlier earthquakes at or above M5.0 — an M5.4 near Panhandle in 1925, an M5.0 near Borger in 1936 and an M5.2 near Dalhart in 1948. The 1925 earthquake remains the largest in the regional list.
The NWS says natural tectonic activity and petroleum production have both been considered as explanations for past Panhandle earthquakes. Sparse seismic records before 1920, when oil and gas development began in the region, make those historical connections difficult to prove or disprove.
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