BEIJING—A strong, shallow earthquake shook southwestern China near the border with Myanmar, killing at least three people and injuring more than two dozen, while a separate, more intense quake early Saturday collapsed a bridge and caused other damage in central China. The first, 6.4 magnitude earthquake hit Yunnan province late Friday. The second 7.3 magnitude quake occurred hours later in the southern part of Qinghai province, about 1,000 kilometers (621 miles) north of the earlier earthquake. U.S. Geological Survey geophysicist Jonathan Tytell said the two quakes were not related. The Qinghai earthquake was followed by 453 aftershocks throughout the early morning into midday, according to the official People’s Daily newspaper. At least eight people were injured. While no deaths have been reported so far in Qinghai province, the quakes tore up roads and bridges, with one collapsing completely, broken into segments. The Yunnan province seismological bureau gave the magnitude of …