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2)., 6: cities damaged around 830 CE, 7: hot springs, 8: sulfate-rich springs.
Inset: location of the study area along the Caribbean-North American plate boundary.
On-fault observations within 7 km of the lake show that soils formed between 16 CE were displaced by the Polochic fault during a long period of seismic quiescence, from 1450 to 1976 CE.
Displacement on the Polochic fault during at least the last 480 years included a component of slip that was aseismic, or associated with very light seismicity (magnitude The North America-Caribbean plate boundary is a left-lateral, mostly submarine structure that surfaces here and there through the Greater Antilles and Central America.
On-fault trenches provide direct evidence for fault displacement, but generally do not allow the distinction between seismic and aseismic slip.
In paleoseismological studies ground disruptions are almost invariably attributed to seismic slip are commonly measured on many faults today.
6), however they reach an age separation of up to 100 years half way up section.
We show that some of the fault slip observed across the floodplain occurred during a 5-century-long period of tectonic quiescence, during which no seismites were generated.
We explore the implications of this record for the seismic behavior of the plate boundary, the demise of the Classic Maya civilization, and the likelihood of future major earthquakes.
In Guatemala, two major structures, the Motagua and Polochic faults (Fig.
Note the shift of the Chixoy River from its pre-2010 bed (dark blue) to its corrected bed (striped light blue).
White dots: The 3.3 m-long sedimentary record of Lake Chichój includes 10 dark-colored seismoturbidites (A to J, Fig. Radiocarbon and varve-based models are in good agreement both at the top and base of the section (Fig.