Question: why has the capital of el salvador been rebuilt several times
[{'answer': 'earthquakes and volcanic eruptions', 'provenance': [{'wikipedia_id': '9356', 'title': 'El Salvador', 'start_paragraph_id': 66, 'start_character': 46, 'end_paragraph_id': 66, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Geography.\n'}]}, {'provenance': [{'wikipedia_id': '9356', 'title': 'El Salvador', 'start_paragraph_id': 66, 'start_character': 0, 'end_paragraph_id': 66, 'end_character': 576, 'bleu_score': 0.979484453366057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15719411375515588214}, 'section': 'Section::::Geography.\n'}]}]