Theories about mass famine have never been confirmed. The evidence used to prove there was an Anatolian famine is based on texts which report grain shipments sent from Egypt to Anatolia. This may indicate a system of trade rather than an actual famine.
Earthquakes are a constant of Mediterranean history, and it has not been proved that there was an especially devastating earthquake in this period.
None of the present explanations for the Bronze Age Collapse has actual concrete evidence and is just theory. On the other hand, there is written evidence of invaders in Syria, Egypt, and the Hittite Empire. There is also written evidence of widespread Greek piracy in Homer. An invasion from a powerful group of seaborne raiders is the best explanation for the Bronze Age Collapse.
Claims of famine, earthquakes, and internal rebellion have not yet been proved. There is strong evidence for invading forces. An alliance of Sea People remains the best explanation for the Bronze Age Collapse.