GUWAHATI, India—An earthquake of magnitude 6 struck India’s rugged northeastern state of Assam on Wednesday, causing cracks in the walls and floors of some structures, but no immediate casualties were reported. The quake hit at a depth of 34 km (21 miles) near the town of Dhekiajuli, 140 km (86 miles) north of the main city of Guwahati, the United States Geological Survey said. “This earthquake was the biggest I can remember, there was first a big jolt and then a smaller one,” said a police official in the town. “We did not receive any distress calls, but people did run out of their homes.” People streamed into the streets for fear of fresh tremors, with some saying the quake left cracks in their homes. “Our entire multi-storied apartment has witnessed massive damage with roofs and walls caving in,” said Subham Hazarika, a businessman living in an upmarket apartment in Guwahati. “Luckily no one …