A magnitude 2.3 earthquake struck early Friday, one day after a magnitude 2 quake hit, the National Geographic Institute said.
The government has connected the tremors to a Castor oil drilling platform, which was shut down by Spain's minister of industry Jose Manuel Soria soon after the first earthquake struck in September, ThinkSpain reported.
Although relatively mild, six earthquakes occurred in December.
The drilling suspected of causing the tremors is 1-1.2 miles under the seabed in the Gulf of Valencia near a pocket of gas that had the potential to produce enough electricity to last the province of Valencia for 50 days, ThinkSpain said.
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