Question: what type of boundary was the mexico earthquake
[{'answer': 'a subduction zone', 'provenance': [{'wikipedia_id': '55287670', 'title': '2017 Puebla earthquake', 'start_paragraph_id': 4, 'start_character': 217, 'end_paragraph_id': 4, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '55287670', 'title': '2017 Puebla earthquake', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7002015190278437145}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55287670', 'title': '2017 Puebla earthquake', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 447, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7002015190278437145}, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '55287670', 'title': '2017 Puebla earthquake', 'section': 'Section::::Background.\n', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['a subduction zone', "Mexico is one of the world's most seismically active regions, sitting atop several intersecting tectonic plates. The border between the Cocos Plate and North American Plate, along the Pacific Coast of Mexico, creates a subduction zone that generates large seismic events. Activity along the edges of the Rivera and Caribbean plates also generate seismic events. All together, these seismic forces cause an average of 40 earthquakes a day in Mexico.", "Mexico is one of the world's most seismically active regions, sitting atop several intersecting tectonic plates. The border between the Cocos Plate and North American Plate, along the Pacific Coast of Mexico, creates a subduction zone that generates large seismic events."]}}]}]