MEXICO CITY (AP) _ Five minor earthquakes rumbled through the southern part of Mexico City on Sunday morning, the Seismological Institute said. No damage or injuries were reported.

The city was struck by powerful earthquakes Sept. 19 and 20 that killed at least 7,000 people and destroyed or badly damaged 3,000 buildings.

Since then, a string of smaller quakes have shaken the capital, often causing panic among residents.

The earthquake service said the first tremor Sunday occurred at 4:37 a.m. and registered 3.5 on the Richter scale. A quake of that magnitude can cause slight damage.

Two more temblors occurred at 4:39 a.m. and 4:40 a.m., measuring 1.0 on the Richter scale. A temblor registering 2.5 was felt at 8:20 a.m. and the fifth, 2.6, occurred at 8:35 a.m., it said.

The epicenter of the temblors was southwest of the city, the institute said.

The Richter scale is a gauge of energy released by an earthquake, as measured by the ground motion recorded on a seismograph. An earthquake measuring 2 on the scale is smallest normally felt by humans. A quake with magnitude of 7 can cause widespread heavy damage.

The Sept. 19 quake in Mexico City measured 8 on the Richter scale, classifying it as a ''great eathquake,'' capable of tremendous damage.