Joint ICPT / TWAS Workshop on
Seismic Sources in Central America
What is the largest earthquake each can produce ?
Heredia, Costa Rica
October 30 – November 5, 2011
Geological Studies for Surficial Faults
Managua, Nicaragua
Marisol Echaverry L. & Antonio Álvarez C.
Instituto Nicaragüense de Estudios Territoriales
Dirección General de Geofísica
Dirección de Geología Aplicada
Geological Setting Managua Area
La Femina, 2002
BACKGROUNDS
31.03.1931
Falla Estadio
Centro Oeste Managua
Richter: 5.8
Depth: 5Km
04.01.1968
Colonia Centroamérica
Centro Sur de Managua
Richter: 4.8
Mercalli: VI
02.01.72
Los Brasiles
16 Km. W Managua
Richter: 5.5
Mercalli: VI
23.12.1972
Tiscapa Fault
Managua Lake
Richter : 6.2
Depth: 5 Km
Investigation of Active Faulting in Managua, Nicaragua
and Vicinity
Vice Ministerio de Planificación Urbana,
Gobierno de la Republica de Nicaragua.
Woodward- Clyde Consultants. November de 1975.
Trench location
Before, 80s
Morfological surficial expression
Exploratory trenches cartography
Disruption and
displacement key stratas
Managua Area
Geological Formations
Local Stratigraphy
Aligneaments and Faults
Age and Correlation
Map of Faults, 1975
BACKGROUNDS
2002 - THE INETER MAP OF FAULTS
DATA BASE

Analysis and integration of consultant reports. 1981 a 2002.

Copies of 400 reports for library

One hundred of lineal kilometers of trenches

Digitizing maps until 1981 (Brown et al., 1973)

Woodward - Clyde Consultants, 1975 and

Ministerio de la Vivienda y Asentamientos Humanos (MINVAH, 1981)
BM / ASDI Proyects, 2001
Objetives and scope
Find evidence of faults: active or not
Geological zoning of the land
Not build on faults
Guarantee the human life and prevent damages of properties
Inspection of Site Study
for Soil Use Requirement
P ro fu n d id a d e n m e tro s
C o rte d e F a lla Tisc a p a -P is ta S u b U rba n a
U bica cio n a 1 0 0 m ts a l E ste de la in te rs ec cio n a l ce n tro d e co n ven cio n es
C es a r A gu sto S ilv a ( p a red S u r) en la P is ta
5
0
10
15
Hs
0 .1 8 m
(H s)
4
H sj
(H f s1 )
(H a q )
3
0 .5 5 m
2
0 .3 7 m
0 .2 8 m
H fs 2
0 .7 8 m
(H a q )
(H s f1 )
(P H aq )
(H s f1 )
0 .7 0m
(P H aq )
(H s f)
0 . 45
1
(H s f)
E sc or ia B as altica
0
0 .6
E sc or ia B as altica
C aid a V er tica l 0 .3 4 m
c aid a late ral iz q u ierd a
b u z am ie n t o 4 2 ° N W
F alla M ay or
1975. Geological Method
F alla T is cap a
E sc a la In d ica d a
H o ja T o p o g ra fica S a n Ju d a s
P ro y e c to G e o lo g ico Estructural
C O N TE N ID O :
G A T 8 -c
d e la s fa llas a ctiv as e n el a re a de M anagua
IN E TE R /B A N C O M U N D IA L/C E PR ED EN A C
L EV A N TO : G us ta vo A ltam iran o T.
D IB U J O : G . A ltam iran o G onzalez
R EV IS O : G raz ie lla D e vo li
Supervision of local geological studies
for soil use requirements
2003. Método Geofísico
Inspection and Approval
Process of the Study
Faults Map of Managua. March 2002, Escale 1:25,000
Estudios geológicos vs Tiempo
Distribución en el tiempo de estudios geológicos de falla local en Managua y alrededores
Periodo 1990 a 2008. Fuente: Ineter, 2008
1990-2008:
2003 – 2008:
2009 – 2011:
1547 reports: 154.7 lineal Km
Geological:
Geophysical:
489
32
180 a 200
BOLETIN SISMOLÓGICO
CONCLUSIONS
Datas about new fault sites, active or not, are available, and others could be
aggregates, but limited. No data about Neotectonics and Paleo seismology are
being colected.
know its seismical activity, above all, the most important faults is
necessary, and study that with no information but densely inhabited.
Could be practical and useful combine these geological studies with geodetics
studies of deformation for prevention of seismic hazard and risk, for Managua
fault region and its vicinity
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Antonio-Alvarez