Question: what was the magnitude of the 1964 alaska earthquake
[{'answer': '9.2 megathrust', 'provenance': [{'wikipedia_id': '240447', 'title': '1964 Alaska earthquake', 'start_paragraph_id': 2, 'start_character': 61, 'end_paragraph_id': 2, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '240447', 'title': '1964 Alaska earthquake', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1019, 'bleu_score': 0.7961276390158291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3058505078547655783}, 'section': 'Section::::Abstract.'}]}]