Bookshelf faulting in Nicaragua

Oblique subduction at a high rate of convergence along much of the Middle America Trench results in northwest-directed trench-parallel block motion. Accommodation of this motion along northwest-striking dextral strike-slip faults has been postulated; however, in Nicaragua such faults are not well developed. We suggest instead that this motion is accommodated by bookshelf faulting that includes northeast-striking left-lateral faults. We present earthquake epicenter and focal mechanism data and mapped fracture and fault data consistent with this model. Trenchward migration of the volcanic arc since the Miocene and reactivation of northeast-striking Miocene structures may have led to the development of this arc- and trench-normal fault system.

[1]  C. Demets.  A new estimate for present‐day Cocos‐Caribbean Plate motion: Implications for slip along the Central American Volcanic Arc , 2001 .

[2]  S. Cande,et al.  Revised tectonic boundaries in the Cocos Plate off Costa Rica: Implications for the segmentation of the convergent margin and for plate tectonic models , 2001 .

[3]  M. Guzmán-Speziale,et al.  Active seismic deformation in the grabens of northern Central America and its relationship to the relative motion of the North America–Caribbean plate boundary , 2001 .

[4]  Danny Hilman Natawidjaja,et al.  Neotectonics of the Sumatran fault, Indonesia , 2000 .

[5]  J. Marshall,et al.  Central Costa Rica deformed belt: Kinematics of diffuse faulting across the western Panama block , 2000 .

[6]  Jan Ehrenborg.  A new stratigraphy for the Tertiary volcanic rocks of the Nicaraguan Highland , 1996 .

[7]  Richard G. Gordon,et al.  Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions , 1994 .

[8]  T. Dixon.  GPS Measurement of Relative Motion of the Cocos and Caribbean Plates and Strain Accumulation Across the Middle America Trench , 1993 .

[9]  R. White,et al.  Destructive upper-crustal earthquakes of Central America since 1900 , 1993, Bulletin of the Seismological Society of America.

[10]  R. Weinberg.  Neotectonic development of western Nicaragua , 1992 .

[11]  R. Mccaffrey.  Oblique plate convergence, slip vectors, and forearc deformation , 1992 .

[12]  M. C. Kleinrock,et al.  Transform zone migration: Implications of bookshelf faulting at oceanic and Icelandic propagating ridges , 1991 .

[13]  M. Beck.  Coastwise transport reconsidered: lateral displacements in oblique subduction zones, and tectonic consequences , 1991 .

[14]  W. Manton.  Tectonic interpretation of the morphology of Honduras , 1987 .

[15]  C. Nicholson,et al.  Seismic evidence for conjugate slip and block rotation within the San Andreas fault system , 1986 .

[16]  R. Jarrard.  Relations among subduction parameters , 1986 .

[17]  D. H. Harlow,et al.  Seismicity at Fuego, Pacaya, Izalco, and San Cristobal Volcanoes, Central America, 1973–1974 , 1983 .

[18]  P. Einarsson,et al.  Earthquake fractures in the districts Land and Rangárvellir in the South Iceland seismic zone (Jarðskjálftasprungur á Landi og Rangárvöllum) , 1982, Jökull.

[19]  M. J. Carr.  Underthrusting and Quaternary faulting in northern Central America , 1976 .

[20]  J. F. Gibbs,et al.  Aftershocks of the Managua, Nicaragua, earthquake and the tectonic significance of the Tiscapa fault , 1974 .

[21]  P. Ward,et al.  Geologic and seismologic aspects of the Managua, Nicaragua, earthquakes of December 23, 1972 , 1974 .

[22]  M. J. Carr,et al.  Quaternary volcanic and tectonic segmentation of Central America , 1973 .

[23]  T. Fitch.  Plate convergence, transcurrent faults, and internal deformation adjacent to Southeast Asia and the western Pacific , 1972 .

[24]  P. Molnar,et al.  Tectonics of the Caribbean and Middle America Regions from Focal Mechanisms and Seismicity , 1969 .

[25]  W. D. Vries,et al.  Tectonics and magma evolution of Nicaraguan volcanic systems. , 1993 .

[26]  R. S. White.  Tectonic implications of upper-crustal seismicity in Central America , 1991 .

[27]  R. Weyl.  Geology of Central America , 1980 .

[28]  Richard E. Stoiber,et al.  Geologic setting of some destructive earthquakes in Central America , 1977 .

[29]  M. Maldonado-Koerdell.  Geological and Geophysical Studies in the Gulf of Fonseca - Nicaragual Depression area, Central America , 1966 .

[30]  A. McBirney,et al.  Volcanic history of Nicaragua , 1965 .