"We needed thousands and thousands of quake events to collect data in great detail and we needed them from all different angles to build up a full picture," explains Lin. Within a couple of years, though, they had enough information. It was bad news: the chamber was both shallower and bigger than they had thought. It was roughly cylindrical in shape, the top a depth of 8km (5 miles), the diameter around 12km (7.5 miles), and about 12km (7.5 miles) tall.

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