Earthquake hits near the pacific coast of Mexico
Local reports on Twitter suggest strong shaking. There was earlier shaking today at a magnitude 4.9 but that appears it was just a tremor setting up for this earthquake.
An earthquake of 8.0 in Mexico 1985 killed at least 5000 people, it was located 350 km away.
The epicenter of this one appears to be closer to Oaxaca's pacific coast, centered near Asunción Tlacolulita.
Update: The USGS early estimate is magnitude 7.7 (then updated to 7.4)
Oaxaca is sparsely populated and early reports don't show any significant damage.
Mexico City's public security ministry says a flyover showed there were no fallen buildings in the city but there is a tsunami warning for 1-3 meter waves along the pacific coast stretching along Mexico and central America.