J L Gautam, scientist with the NCS told PTI, "The quake occurred at 5.19 pm at a depth of 10 kilometres inside the sea off the coast of Palghar, some 78 kilometres north west of the metropolis."
The NCS is an institute under the Ministry of Earth Sciences and is the nodal agency of the Union government for monitoring earthquakes.
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Meanwhile, smog containing gases from a restive Philippine volcano sickened dozens of students and prompted 25 towns and cities to shut their schools on Friday as a health precaution, officials said.
(with inputs from PTI)