Narrative:

While at cruise at FL310; a sudden violent shake and vibration occurred. No fire indication; but no N1 indication on number one engine. [Advised ATC] and we requested lower altitude. Qrc reference card accomplished crew comm and communication established. Engine fire; severe damage checklist accomplished. Passenger oxygen system had been deployed automatically. Requested divert to ZZZ. We accomplished descent and approach checklist. Confirmed emergency with approach and requested assistance.

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Original NASA ASRS Text

Title: B737NG Captain reported a severe engine failure in cruise that resulted in a diversion.

Narrative: While at cruise at FL310; a sudden violent shake and vibration occurred. No fire indication; but no N1 indication on number one engine. [Advised ATC] and we requested lower altitude. QRC reference card accomplished Crew COMM and communication established. Engine Fire; Severe Damage Checklist accomplished. Passenger Oxygen System had been deployed automatically. Requested divert to ZZZ. We accomplished Descent and Approach Checklist. Confirmed emergency with approach and requested assistance.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.