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Seismologists studying the earthquake that struck northern California in October 1989 are still investigating some of its mysteries：the unexpected power of the seismic waves,the upward thrust that threw one man straight into the air, and the strange electromagnetic signals detected hours before the temblor.
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JuicyJick
"Some of mysteries:", once you see the colon and notice the word 'mysteries', you should be aware of the following content in which there should be two parallel nouns or noun phrases. And you see that the first part of the parallel construction is an appositive clause that is noun clause. The second part of that is a noun phrases. So a noun phrase and noun clause can match up.
