On September 29 , 1717 , the San Miguel earthquake struck the city .
On September 29 , 1717 , the San Miguel earthquake destroyed the San Lucas School building ; the tremor cracked the tower and destroyed the top part of the main gate .
On September 29 , 1717 , the San Miguel earthquake struck the city and destroyed the San Lucas School building ; the tremor cracked the tower and destroyed the top part of the main gate .