An aftershock measuring 5.7 magnitude was felt Change_sentiment on January 15 , an event not widely reported Reporting outside the country until after the February quake , which initially was assessed by the USGS at 5.7 magnitude as well .

The three largest events were the M7.2 thrust mainshock Catastrophe that struck Attack near the unincorporated community of Petrolia midday on April 25 and two primary strike-slip aftershocks Catastrophe measuring 6.5 and 6.6 that followed early the next morning .

With an estimated initial mass of about 12,000–13,000 tonnes ( 13,000–14,000 short tons , heavier than the Eiffel Tower ) , and measuring about in diameter , it is the largest known natural object to have entered Arriving Earth 's atmosphere since the 1908 Tunguska event , which destroyed Destroying a wide , remote , forested , and very sparsely populated area of Siberia .

By 24 January , at least 52 aftershocks Catastrophe measuring 4.5 or greater had been recorded Control .