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INTRODUCTION

n 15 August 2007 an earthquake ofagnitude Mw 8.0 centered off the coast

central Peru, offshore of the Pisco cityenerated a tsunami. According to HarvardMT solution, the earthquake ocurred at3:40:57 UTC (18:40 peruvian time) withpicenter located at 13.67S, 76.79W. Theumerical simulation of tsunami is shown inree phases: generation, propagation andundation; the validation has beenerformed with field post-tsunami survey ofHN, Peruvian Navy.

XIV GIAMBIAGI WINTER SCHOOL 2012Applied and Environmental Geophysics

THE 15 AUGUST 2007 PERU TSUNAMI: NUMERICAL MODELING,OBSERVATION AND VALIDATION

Nabilt Moggiano1,2 , Csar Jimenez 1,2

nmoggiano@fisica.unmsm.pe, cjimenezt@unmsm.edu.pe1Laboratorio de Fsica de Eventos Naturales, Facultad de Ciencias Fsicas, Universidad Nacional Mayor de San Marcos; 2Direccin de Hidrografa y Navegacin de la Marina de Guerra del Per

(*) General Bathymetric Chart of the Oceans (GEBCO), http://www.gebco.net/

DOMAINLONGITUDE LATITUDE RESOLUTION DATA SOURCE

Min Max Min Max arc-sec. Bathymetry Topography

1 -78.40 -74.42 -15.70 -11.65 27.00 (*)GEBCO 30c GEBCO 30c

2 -77.50 -75.55 -14.50 -13.00 9.00 GEBCO 30c GEBCO 30c

3 -77.20 -76.00 -14.20 -13.20 3.00 GEBCO 30c GEBCO 30c

4 -77.00 -76.13 -13.94 -13.42 1.00 DHN DHN

INUNDATION RESULTS

REFERENCESOkada, Y., (1985), Surface Deformation Due to shear and Tensile Faults in Half-space, Bulletin Seismological Society of America. Vol. 75, No. 4, 1135-1154

Csar J., Moggiano N.: Fuente ssmica del terremoto de pisco 2007 a partir de inversin de registros mareogrficos (to be published)

mamura, F., Yalciner, A., and Ozyurt, G. (2006): Tsunami modelling manual, http://www.tsunami.civil.tohoku.ac.jp/hokusai3/E/projects/manual-ver-3.1.pdf

Fritz, H. M., Kalligeris, N., Borrero, J. C., Broncano, P., and Ortega, E. (2008), The 15 August 2007 Peru Tsunami run-up Observations and Modeling, Geophysical Research Letters, vol. 35, L10604, doi: 10.1029/2008GL033494, (2008).

erform the simulation of tsunami of the August 15, 2007 Peru earthquake,

three phases and validate the tsunami numerical modeling with the

opose to use it as model to create future tsunami hazard maps.

The numerical simulation of tsunami propagation and inundation is carried ouusing TUNAMI-N2 [3] for near field. The numerical model TUNAMI is based in theresolution of the equations of fluid dynamics: continuity equation, momentumequation, using the finite difference method. The snapshots of tsunampropagation is for a total time of 4.5 hours.

PROPAGATION: SIMULATION OF TSUNAMI

OBJETIVES

Uplift and subsidence (m)

he initial sea bottom deformation is the instant push up of the coseismic

eformation and reflects the initial water surface elevation that is assumed

s the initial condition of the tsunami propagation. This is calculated withhe tsunami wave inversion model for each sub-sources (total 8) with a

nitary slip using Okadas theory [1].and focal mechanism data [2].

GENERATION: SEAFLOOR DEFORMATION

e computational area is divided in four domains and each domain is

nnected by using nested grid system. The bathymetry and topography data

r the first to the third domains are interpolated from GEBCO and for the

urth domain (here the inundation is calculated) is generated from the

unding bathymetry and topography measurements from Directorate of

ydrography and Navigation (DHN).

METHODOLOGY

CONCLUSIONS

1

234

Digital Elevation Model (DEM) for Domain 4

The results of numerical tsunami simulation in terms of inundation and propagat

shown that coseismic deformation model based in 8 sub-sources from the tsuna

waveform inversion is more appropriate approximation compared to the fi

survey. For example, the inundation maximum distance was in Lagunillas with 2 k

with good approximation of the numerical model. However, we may need

improve the tsunami source inversion results.

PISCO

SAN ANDR

PARACAS

LAGUNILLAS

-14.50

-14.00

-13.50

-13.00

-12.50

-12.00

-11.50

0.00 2.00 4.00 6.00 8.00 10.00 12.00

Latitude

Height (m)

Field Measurements (DHN)

PISCO

SAN ANDRS

PARACAS

LAGUNILLAS

It has developed the following Tsunami Inundation Map for the principal cities (Pisc

San Andrs, Paracas and Lagunillas) affected by the tsunami 2007. The results

numerical simulation were compared with the post tsunami field measurement da

[4].NUMERICAL SIMULATION vs. FIELD MEASUREMENTS

ACKNOWLEDGEMENT

I would like to express my heartiest gratitude and sincere thanks to Raquel Rios (DHN

Ing. Erick Ortega (DHN), Eduardo Choque (DHN), Dra. Mariella Berrocal (UNMSM

Miguel Saavedra (IGP), MSc. Vanessa Tardillo (UFV) and Vicerrectorado de Investigaci

(VRI-UNMSM).