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Database and Map of Quaternary faults and folds of Ecuador and its offshore regions

By Arturo Eguez, Alexandra Alvarado, Hugo Yepes, Michael N. Machette, Carlos Costa and Richard L. Dart

U.S. Geological Survey Open-File Report 03-289

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Version 1.0


This database and map summarizes evidence for faults and folds with Quaternary (<1.6 Ma) movement in Ecuador and its offshore regions. Ecuador borders the Pacific Coast and as such lies above the active subduction interface between the Nazca and South American plates. Remote-sensing data, regional geologic mapping, consulting reports, and other literature contain evidence for Quaternary faulting and folding and reactivation of crustal fault and fault zones, although most of this data is of a reconnaissance nature. The map and report (database) include geologic and geographic information for these faults, including estimates of fault ages, slip rates, recurrence intervals, and references. This publication, which is the ninth in a series for Central and South America countries, is a product of the International Lithosphere Program’s Task Group II-2 “World Map of Major Active Faults.” The other country reports are available as USGS Open-File Reports 98-481 (Costa Rica), 98-779 (Panama), 00-018(Venezuela), 00-180 (Argentina), 00-283(Bolivia/Chile), 00-284 (Colombia), 00-437 (Managua area, Nicaragua), and 02-230 (Brazil).

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Map PDF file (1.21 MB)
Database PDF file (474 KB) Data to accompany map (For viewing and printing)
Database HTML file
Data to accompany map (This version of the report is accessible as defined in Section 508.) logo  Take Pride in America button