Guwahati: After the earthquake of 6.4 magnitude on the Richter scale on Wednesday, Assam’s Sonitpur was struck by six tremors on Thursday. Earlier today, earthquakes of magnitude 2.6, 2.9, 4.6, 2.7, and 2.3 on the Richter Scale had hit Sonitpur at 12.24 am, 1.10 am, 1.20 am, 1.41 am and 1.52 am respectively.