A 6.4 magnitude earthquake struck the coast of southern Mexico on Thursday, the U.S. Geological Survey reports. 

The earthquake struck about 60 miles northwest of Acapulco, according to Reuters. 

The quake shook Mexico City, which is located 190 miles northeast of the quake's epicenter. The quake's epicenter was in the western Mexican state of Guerrero at a depth of 14.9 miles inland from the Pacific Coast. 

A Mexican journalist reported that the quake lasted 40 seconds, during which office workers evacuated buildings and spilled out onto the street. The report also said Mexico City received a 68-second warning that the quake was approaching. 

While city dwellers were shocked by the quake, there were no immediate reports of injuries or damage. 

"I was working when I started to feel seasick and we left the office," said Andres Alcocer, 34, a publicist in Mexico City.

The Pacific Tsunami Warning Center said their investigation shows that there will not be a tsunami threat in Hawaii. 

The USGS downgraded the initial magnitude of the quake from 6.8 to 6.4. The quake was also initially reported to have been shallower. 

Finance Minister Luis Videgaray was giving a speech at the National Palace in Mexico City when the quake began. 

"I think we'd better take a pause if you don't mind," he said, leaving the stage. 

Pemex, a mammoth Mexican oil company, said it do not believe there was any impact to the company's installations, as most are located far from the quake's epicenter. 

Mexican news stations said that there was no damage to the holiday resort town of Acapulco, which is near the epicenter. 

Mexico and Central American countries have been shaken by quakes along the Pacific in the past few months. There was also a giant 7.4 magnitude quake in March 2012, but it did not cause major damage. 

One of the worst earthquakes to hit Mexico was in 1985, when an 8.1 earthquake killed thousands of people in Mexico City.