Far-Field Tsunami Hazard in New Zealand Ports
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We present the results of a numerical modeling study investigating the effects of far-field tsunamis in New Zealand ports. Four sites (Marsden Point, Tauranga, Harbor, Port Taranaki and Lyttelton Harbor) were selected based on a combination of factors such as economic importance and the availability of historical and/or instrumental data. Numerical models were created using the ComMIT tsunami modeling tool and the Method Of Splitting Tsunami (MOST) hydrodynamic model. Comparison of model results to measured data from recent historical events showed that, for particular sites and events, the model correlated well with the timing and amplitude of the observed tsunami, and, in most cases, there was generally good agreement between the and modeled tsunami heights and current speeds. A sensitivity analysis for tsunami heights and current speeds was conducted using a suite of large (M W 9) tsunamigenic earthquake sources situated at regular 15° intervals in azimuth along the Pacific Rim while another set of scenarios focused on regional tsunami sources in the Southwest Pacific. Model results were analyzed for tsunami heights and current speeds as a function of the source region. In terms of currents, the analysis identified where speeds were greatest and which source was responsible. Results suggested that tsunamis originating from Central America produced the strongest response in New Zealand. The modeling was also used to determine the timing and duration of potentially dangerous current speeds as well as minimum ‘safe depths’ for vessel evacuation offshore. This study was motivated by the desire to reduce damage and operational losses via improved forecasting of far-field tsunamis at New Zealand ports. It is important that forecasts are accurate since tsunami damage to ships and facilities is expensive and can be mitigated given timely warnings and because preventable false alarms are also costly in terms of lost productivity. The modeling presented here will underpin efforts to produce port-specific guidance and information in the event of future Pacific tsunamis.
KeywordsTsunami ports long waves earthquake natural hazards New Zealand
The Natural Hazards Research Platform of New Zealand’s Ministry of Business, Innovation, and Employment provided funding for this study. Aggeliki Barberopoulou assisted in the development of bathymetric grids for Port Taranaki and Marsden Point. Liam Wotherspoon provided the data used in Fig. 2.
- Amanda R. Admire, A., Dengler, L., Crawford, G., Uslu, B., Borrero, J.C., Greer, S. and Wilson, R. (2014) Observed and Modeled Currents from the Tohoku-oki, Japan and other Recent Tsunamis in Northern California, Pure and Applied Geophysics, doi: 10.1007/s00024-014-0797-8.
- Beavan, J., Wang, X., Holden, C., Wilson, K., Power, W., Prasetya, G., Bevis, M., Kautoke, R., (2010). Near-simultaneous great earthquakes at Tongan megathrust and outer rise in September 2009. Nature 466, 959–964. doi: 10.1038/nature09292.
- Borrero, J., Bell, R., Csato, C., DeLange, W., Greer, D., Goring, D., Pickett, V. and Power, W. (2012) Observations, Effects and Real Time Assessment of the March 11, 2011 Tohoku-oki Tsunami in New Zealand, Pure and Applied Geophysics, doi: 10.1007/s00024-012-0492-6.
- Borrero, J.C. (2013) Numerical modeling of tsunami effects at two sites on the Coromandel Peninsula, New Zealand: Whitianga and Tairua-Pauanui, Waikato Regional Council Technical Report 2013/24.Google Scholar
- Borrero, J.C. and Greer, S.D. (2012) Comparison of the 2010 Chile and 2010 Japan tsunamis in the Far-field, Pure and Applied Geophysics, doi: 10.1007/s00024-012-0559-4.
- Daubechies, I. (1988) Orthonormal bases of compactly supported wavelets. Communications in Pure and Applied Mathematics 41:909–996.Google Scholar
- De Lange, W. P., and Healy, T. R. (1986). New Zealand tsunamis 1840–1982. New Zealand Journal of Geology and Geophysics, 29(1), 115–134. doi: 10.1080/00288306.1986.10427527.
- Dengler, L.A., Uslu, B., Barberopoulou, A., Borrero, J.C., and Synolakis, C. (2008). The Vulnerability of crescent city, California, to Tsunamis Generated by Earthquakes in the Kuril Islands Region of the Northwestern Pacific, Seismological Research Letters, Vol. 79, No. 5, September/October, 2008, 608–619.Google Scholar
- Fritz, H., Petroff, C., Catalán, P., Cienfuegos, R., Winckler, P., Kalligeris, N., Weiss, R., Barrientos, S., Meneses, G., Valderas-Bermejo, C., Ebeling, C., Papadapoulos, A., Contreras, M., Almar, R., Dominguez, J., and Synolakis, C. (2011a), Field survey of the 27 February 2010 Chile tsunami, Pure Appl. Geophys., 168, 1989–2010.Google Scholar
- Fritz, H.M., Borrero, J.C., Synolakis, C.E., Okal, E.A., Weiss, R., Titov, V., Jaffee, B., Foteinis, S., Lynett, P., Chan, I., and Liu, P.L-F (2011b) Insights on the 2009 South Pacific Tsunami in Samoa and Tonga from Field Surveys and Numerical Simulations, Earth Sci. Revs., 107, 66–75.Google Scholar
- Goring, D. (2009). Meteo-tsunami resulting from the propagation of synoptic-scale weather systems. Phys. Chem. Earth 34, 1009–1015.Google Scholar
- Goring, D. and Henry, R., (1998), Short period (1-4 h), sea level fluctuations on the Canterbury coast, New Zealand, N. Z. J. Mar. Fresh. Res., 32, 119–134.Google Scholar
- Hinwood, J. and McLean E. (2012) Effects of the March 2011 Japanese Tsunami in Bays and Estuaries of SE Australia, Pure and Applied Geophysics, doi: 10.1007/s00024-012-0561-x.
- Hubbard, B. B. (1996) The world according to wavelets: the story of a mathematical technique in the making. A. K. Peters Ltd, 264 pp.Google Scholar
- Lay, T., Ammon, C.J., Kanamori, H., Rivera, L., Koper, K.D., Hutko, A.R., (2010) The Samoa– Tonga great earthquake triggered doublet. Nature 466, 964–968. doi: 10.1038/nature09214.
- Lynett, P., Borrero, J., Weiss, R., Son, S., Greer, D., Renteria, W. (2012) Observations and Modeling of Tsunami-Induced Currents in Ports and Harbors, Earth and Planetary Science Letters, 327–328 (68–74).Google Scholar
- Lynett, P., Borrero, J., Son, S., Wilson, R. and Miller, K. (2014) Assessment of Tsunami Induced Current Hazard, Geophys. Res. Lett., doi: 10.1002/2013GL058680.
- Mofjeld, H.O., Titov, V.V., Gonzalez, F.I. and Newman, J.C. (2001) Tsunami scattering provinces in the Pacific Ocean, Geophys. Res. Lett. 28(2) 335–338.Google Scholar
- Okal, E.A., Fritz, H.M., Synolakis, C.E., Borrero, J.C., Weiss, R., Lynett, P., Titov, V.V., Foteinis, S., Jaffe, B.E., Liu, P. L.-F and Chan, I-c., (2010) Field Survey of the Samoa Tsunami of 29 September 2009, Seismological Research Letters 81(4):577–591.Google Scholar
- Okal, E.A., A. Sladen, and E.A.-S. Okal, Rodrigues, (2006a) Mauritius and Réunion Islands, field survey after the December 2004 Indian Ocean tsunami, Earthquake Spectra, 22, S241–S261.Google Scholar
- Okal, E.A., H.M. Fritz, P.E. Raad, C.E. Synolakis, Y. Al-Shijbi, and M. Al-Saifi, (2006b) Oman field survey after the December 2004 Indian Ocean tsunami, Earthquake Spectra, 22, S203–S218.Google Scholar
- Okal, E.A., H.M. Fritz, R. Raveloson, G. Joelson, P. Pancoskova, and G. Rambolamanana, (2006c) Madagascar field survey after the December 2004 Indian Ocean tsunami, Earthquake Spectra, 22, S263–S283.Google Scholar
- Power, W. L., Downes, G., and Stirling, M. (2007). Estimation of Tsunami Hazard in New Zealand due to South American Earthquakes. Pure and Applied Geophysics, 164(2–3), 547–564. doi: 10.1007/s00024-006-0166-3.
- Power, W., Wallace, L., Wang, X., Reyners, M. (2011). Tsunami Hazard Posed to New Zealand by the Kermadec and Southern New Hebrides Subduction Margins: An Assessment Based on Plate Boundary Kinematics, Interseismic Coupling, and Historical Seismicity, Pure and Appl. Geophys. doi: 10.1007/s00024-011-0299-x.
- Prasetya, G. and Wang, X. (2011) Tsunami frequency analysis for Eastern Coromandel and Waikato Region from Kermadec Trench and local sources within the Bay of Plenty, GNS Science Consultancy Report 2011/135 June 2011.Google Scholar
- Satake, K. (2010). Double Trouble at Tonga, Nature, 466, pp. 931–932.Google Scholar
- Tang, L., Titov, V.V., Bernard, E., Wei, Y., Chamberlin, C., Newman, J.C., Mofjeld, H., Arcas, D., Eble, M., Moore, C., Uslu, B., Pells, C., Spillane, M.C., Wright, L.M., and Gica, E. (2012) Direct energy estimation of the 2011 Japan tsunami using deep-ocean pressure measurements, J. Geophys. Res., doi: 10.1029/2011JC007635.
- Titov, V.V., and González, F.I., (1997) Implementation and testing of the Method of Splitting Tsunami (MOST) model NOAA Technical Memorandum ERL PMEL-112, 11 pp.Google Scholar
- Titov, V., Moore, C., Greenslade, D., Pattiaratchi, C., Badal, R., Synolakis, C., and Kanoglu, U. (2011) A New Tool for Inundation Modeling: Community Modeling Interface for Tsunamis (ComMIT), Pure Appl. Geophys., doi: 10.1007/s00024-011-0292-4.
- Titov V.V. and Synolakis, C.E., (1997) Extreme inundation flows during the Hokkaido-Nansei-Oki tsunami, Geophysical Research Letters, 24(11), 1315–1318.Google Scholar
- Titov, V.V. and Synolakis, C.E., (1998) Numerical modeling of tidal wave runup, Journal of Waterways, Port, Coastal and Ocean Engineering, ASCE, 124(4), 157–171.Google Scholar
- Wei, Y., Chamberlin, C., Titov, V., Tang, L., and Bernard, E. (2012) Modeling of the 2011 Japan tsunami: lessons for near-field forecast, Pure Appl. Geophys in press.Google Scholar
- Wilson, B. W. (1972) Seiches. In: Advances in Hydroscience, Vol 8:1–94.Google Scholar
- Wilson, R., Admire, A., Borrero, J., Dengler, L., Legg, M., Lynett, P., McCrink, T., Miller, K., Ritchie, A., Sterling, K., and Whitmore, P. (2012) Observations and Impacts from the 2010 Chilean and 2011 Japanese Tsunamis in California (USA), Pure and Applied Geophysics, doi: 10.1007/s00024-012-0527-z.