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Keywords: outdoor Guatemala Earthquake 1976. "Mole tracks" track the Motagua fault where it crosses the Gualan soccer field. Note that mole tracks are best developed in hard packed, brittle surface materials. Credit: USGS, 1976 Guatemala Earthquake 1976. "Mole tracks" track the Motagua fault where it crosses the Gualan soccer field. Note that mole tracks are best developed in hard packed, brittle surface materials. Credit: USGS, 1976 |