U.S. DEPARTMENT OF THE INTERIOR OPEN FILE REPORT U.S. GEOLOGICAL SURVEY OFR 00-437 Pamphlet accompanies map

88° ° 87° 86° 85° 84° 83 90° 89° 88° 87° 86° 85° 84° 83° 82° 14° 30' 14° 30' 17° Comayagua Belize 86° 45' 86° 30' 86° 15' 86° 00' 85° 45' 3 PLATE MOTION ° ° Talanga 12 30' 12 30' NORTH AMERICAN MAP Villa de San Antonio La Paz Santa Marta NI-02 DETAILED MAP PLATE A ° ˚ 16 San Juan de Flores OF Puerto Villa de San Francisco Momotombo REGION Columbus Mine Tuapi Moroceli Tegucigalpa Isla Momotombito

Danli Bonanza 15° Lago de Managua NI-09 PUERTO CABEZAS Yuscaran Nagarote La Constancia Guatemala Jalapa La Rosita Karata Honduras HONDURAS El Paraiso 12° 15' NI-06 ° Corinto NI-03 12 15' ° EL 14 NI-07 Tipitapa SALVADOR NI-05 El Salvador Rio Wany NI-08 Baka 1931 CARIBBEAN Santa Rosa de Lima Duyure 17˚ Ocotal Wiwili NI-03 PLATE 1972 Malacatoya Palmera Wounta 13° Nacaome Managua ? 1772? 2 Alianza 1765? ° 1772? 13° 30' 13 30' Somoto

San Lorenzo San Marcos de Colon Xalaguina NI-06 NI-04 NI-07 NI-09 ° San Antonio NI-08 PRINZAPOLCA 12 La Union Choluteca 12° 00' ° San Sebastian de Yali 12 00' Lago Makantaka Isla Conchaguita de Apanas

Cedeno Granada Isla Meanguera El Triunfo COCOS Jinotega San Francisco 11 ° Esteli San Pedro del Norte Masatepe Lago de PLATE Golfo de Fonseca Somotillo 1 Nicaragua Costa Rica Rio Grande Rio Blanco Diriamba Jinotepe Villa Nueva Tapales 0 50 100 km El Tanque Matagalpa 10 ° Matiguas NI-10 NICARAGUA Nandaime Villa Salvadorita ° Mina El Limon 11 45' 11° 45' Ciudad Dario PLATE MOTION DATA

Tasbapauni El Viejo No.Location Fixed Plate Moving Plate Relative Direction Velocity (Azimuth) NI-01 Isla Zapatera Casares Pica Pica 1 88.4 W/10.7 N Caribbean Cocos 13.2 cm 320 Chichigalpa Pacific OceanNauawas NI-10 2 88.4 W/16.6 N Caribbean North America 0.3 cm 43 3 89.4 W/16.0 N North America Caribbean 0.3 cm 226 ° 12° 30' La Fe 12 30' NI-02 Corinto Leon A Boaco Puerto Set Net Momotombo Isla 0 Tabalwas25 kilometers NI-02 Momotombito Veracruz Lago de Managua Nagarote NI-09 NI-06 NI-03 11° 30' 11° 30' MAP EXPLANATION SIMBOLOGIA DEL MAPA Mateare ° Tipitapa 86 45' 86° 30' 86° 15' 86° 00' 85° 45' Puerto Sandino NI-05 NI-08 TIME OF MOST RECENT SURFACE RUPTURE Kukra Hill EDAD DE ULTIMA RUPTURA SUPERFICIAL Malacatoya 1972 NI-03 Cara de Mono Isla del Maiz Grande 1972 Managua Juigalpa Historic (year) ? Holocene (<10,000 yrs) or post glacial (<15,000 yrs) NI-06 El Transito NI-04 NI-07 NI-09 Quaternary, undifferentiated (<1,600,000 yrs) Bluefields NI-08 SLIP RATE Masaya TASA DE DESPLAZAMIENTO Granada Acoyapa > 5 mm/yr Masatepe Bahia de 1-5 mm/yr Pacific Ocean Diriamba Bluefields San Ubaldo Jinotepe NICARAGUA < 1 mm/yr Nandaime NI-10 QUALITY CALIDAD Continuous at map scale Continua a la escala del mapa Poor or discontinuous at map scale Pica Isla Zapatera Pobre o discontinua a la escala del mapa Casares Pica Colonia Guinea NI-10 Inferred or concealed Inferida u oculta Morrito STRUCTURE TYPE TIPO DE ESTRUCTURA Alta Veracruz Gracia Punta Gorda 11° 30' 11° 30' Thrust or reverse fault (teeth on upper block) Strike-slip fault (sense unknown) Isla de Ometepe Right-lateral (dextral) strike-slip fault San Miguelito Rivas Left-lateral (sinistral) strike-slip fault Lago de Nicaragua Normal fault

San Juan del Sur

Cardenas Caribbean Sea QUATERNARY FAULTS OF NICARAGUA Archipielago de LAS FALLAS CUATERNARIAS DE NICARAGUA Colon Solentiname La Cruz Number Name of structure Sense of movement Bahia Los Chiles El Castillo (major/minor) Santa Elena Bahia de San Número Nombre de estructura Sentido de movimiento CR-01 Juan del Norte (mayor/menor) Upala NI-01 La Pelona fault zone Unknown <15 ka <1.0 NI-02 La Paz Centro fault zone Unknown <15 ka 0.2-1.0 NI-03 Mateare fault zone Unknown <1.6 Ma 0.2-1.0 (?) NI-04 Asososca-Acahualinca and San Judas fault Unknown <15 ka 0.2-1.0 (?) COSTA RICA zone (Managua graben) NI-05 Estadio fault Left-lateral Historic (1931) 0.2-1.0 (?) NI-06 Tiscapa fault Left-lateral Historic (1972) 0.2-1.0 (?) Golfo de CR-03 Trinidad 0 50 100 kilometers Papagayo San Rafael NI-07 Aeropuerto fault Strike slip Historic (1650-1880, possibly 1765 0.2-1.0 (?) or 1772) Liberia NI-08 Unnamed faults, Eastern Managua graben Strike slip <15ka, possibly historic (1772?) 0.2-1.0 (?) CR-04 NI-09 Cofradia Fault, Eastern Managua graben Normal <15 ka <1.2 Bagaces NI-10 Ochomogo fault zone Not reported <15 ka 0.2-1.0 (?) 10° 30' Sardinal CR-05 10° 30' 88° 87° 86° 85° 84° 83°

Map of Quaternary faults in the vicinity of Managua, Nicaragua

A project of International Lithosphere Program Task Group II-2, Major Active Faults of the World

A cooperative project between the U.S. Geological Survey (USGS) and Institute of Geosciences, University of Panama

Data compiled by Hugh Cowan and Xavier Amador. Digital representation by Karen S. Morgan and Richard L. Dart. Graphical representation by Lee-Ann Bradley. Project coordination by Michael N. Machette This map was produced on request, directly from digital files, on an electronic plotter. It is also available as a PDF file at (Co-chairman, ILP Task Group II-2). http://geology.cr.usgs.gov Digital data prepared with ARC/INFO version 7.2.1 running under Solaris version 2.7 on a Unix workstation. Last revision July, 2000. 2000 Map prepared by L.-A. Bradley using Adobe Illustrator version 9.0. Last revision September 2000. This report is preliminary and has not been reviewed for conformity Scale 1:750,000 Mercator Projection with U.S. Geological Survey editorial standards. Any use of trade, product, or firm names is for descriptive purposes and does not (Longitude of central meridian, 85 W; latitude of true scale, 0; Clarke 1866 spheroid) imply endorsement by the U.S. Government.