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  Services » Regional Services » Regional hazards and emergency management » Coastal hazards including tsunami » Tsunami » Coromandel Peninsula and Firth of Thames Tsunami Hazards

Coromandel Peninsula and Firth of Thames Tsunami Hazards

On this page: About, Whitianga and Mercury Bay, Cooks Beach, Hahei and Hot Water Beach,  Matarangi, Whangapoua, Kennedy Bay, Kuaotunu and Opito Bay, Whangamata, Whiritoa, Pauanui and Tairua

About

Early scientific work dating back to 2002 identified that the east coast of the Coromandel Peninsula is at risk from tsunami hazards. The emphasis on tsunami hazards increased following the South-east Asian tsunami in 2004, and this resulted in development of the first scientific modelling study of Whitianga and Mercury Bay in 2008. The 2008 study provided new information about the risk of large tsunami hitting Whitianga as a result of a major earthquake in the Tonga-Kermadec trench to the north-east of New Zealand. The devastating earthquake which struck Japan in 2011 was another graphic example of the threat posed by tsunami generated just offshore.

Eastern Coromandel Tsunami Strategy

In order to address the risk of tsunami along the eastern coast of the Coromandel Peninsula, Thames-Coromandel District Council, Hauraki District Council and Waikato Regional Council developed the ‘Eastern Coromandel Tsunami Strategy’. The purpose of the strategy is to identify tsunami hazards and minimise risks by informing and working with communities along the east coast of the Coromandel Peninsula.

Initial work undertaken in 2010/11 for Whitianga and Mercury Bay was followed up in 2013/14 with work in the Tairua and Pauanui communities, Whangamata and Whiritoa in 2014/15, Matarangi and Whangapoua in 2015/16, Kuaotunu, Opito Bay, Kennedy Bay and Mercury Bay in 2017/18, and Cooks Beach in 2018/19.

The work undertaken from 2008 onwards assessed the risk of tsunami affecting the eastern Coromandel Peninsula from both distant and near sources (see the overview of each of the coastal areas below). After each assessment, public open days or information sessions were held for each community. The open days provided a good opportunity for people to learn about tsunami hazards and risks on the Coromandel Peninsula, and an opportunity to provide input on how risks should be managed.

 

Evacuation maps and procedures

The tsunami assessments have been used to assist communities in understanding what to do when there is a tsunami threat. To know more about evacuation procedures due to a tsunami threat, please click here(external link). 

 

Coromandel Peninsula east coast

Whitianga and Mercury Bay

Tsunami open day at Whitianga.

The first scientific modelling study of Whitianga and Mercury Bay was completed in 2008. The results of the study were discussed with the Whitianga community at two ‘open days’ in June 2011, the first to be held on the Coromandel Peninsula.

Significant changes to scientific modelling took place following the 2011 Japan tsunami, and this improved understanding led to improved modelling across the Coromandel Peninsula from 2012 onwards.

A report on the effects of the 1960 Chile tsunami(external link) undertaken in 2014 uncovered new information about the impact of distant tsunami on Whitianga, and provided verification of the scientific modelling. A reassessment of Whitianga and Mercury Bay tsunami hazard modelling was completed in 2017. In addition to Whitianga township, the 2017 assessment includes Wharekaho (Simpsons) Beach, Flaxmill Bay, Cooks Beach, Hahei and Hot Water Beach.

The 2017 assessment draws upon improvements in modelling since 2012, the 1960 Chilean tsunami report for Whitianga completed in 2014, and brings the modelling into line with other areas across the Coromandel Peninsula.

Tsunami assessments

Managing Tsunami Risks in Mercury Bay [PDF, 2 MB]

Numerical Modelling of Tsunami Inundation in Whitianga, Mercury Bay, Hahei and Hot Water Beach - 2016 [PDF, 6.7 MB] 

Numerical Modelling of Tsunami Inundation in Whitianga, Mercury Bay, Hahei and Hot Water Beach - 2016 (APPENDICES) [PDF, 15 MB]

Maps - Near Source - ‘Maximum Credible Event’

Map: Tsunami modelling - elevation of area [PDF, 12 MB]

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Maps - Distant Source

(note that Whitianga is the only significant area along the eastern Coromandel that is susceptible to tsunami inundation from a Distant Source event)

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Previous Whitianga work (2010/11)

The previous information is available by request here.

 

Cooks Beach, Hahei and Hot Water Beach

Cooks Beach, Hahei and Hot Water Beach communities were included as a part of the 2017 Whitianga and Mercury Bay modelling assessment. An open day was held in Cooks Beach in November 2018 to share the results of the modelling with the community.

Tsunami assessments

Managing Tsunami Risks in Mercury Bay [PDF, 2 MB]

Numerical Modelling of Tsunami Inundation in Whitianga, Mercury Bay, Hahei and Hot Water Beach - 2016 [PDF, 6.7 MB]

Maps - Cooks Beach

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Maps - Hahei

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Maps Hot Water Beach

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

 

Matarangi, Whangapoua, Kennedy Bay, Kuaotunu and Opito Bay

Scientific modelling of tsunami inundation along the Kennedy Bay to Opito Bay coast was completed in 2015. Open days were held in Matarangi and Whangapoua in January 2016, in Kennedy Bay in June 2016, and in Kuaotunu and Opito Bay in October 2016.

Tsunami assessments

Managing tsunami risks in Matarangi and Whangapoua [PDF, 2.4 MB]

Numerical modelling of tsunami inundation along the Kennedy Bay to Opito Bay coast, Coromandel Peninsula, New Zealand [PDF, 13 MB]

Appendices [PDF, 25 MB]

Maps - Matarangi and Whangapoua

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Maps - Kennedy Bay

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Maps - Kuaotunu

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

Maps - Opito Bay

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard

 

Whangamata

Scientific modelling of tsunami inundation in Whangamata and Onemana was completed in 2015. An open day was held in Whangamata in January 2015 to share the results with the community.

Tsunami assessments

Managing tsunami risks in Whangamata

Numerical Modelling of Tsunami Inundation at Whangamata, Whiritoa and Onemana, Coromandel Peninsula, New Zealand

Maps

These posters and the following maps were on display at the tsunami open day in January 2015:

Map: Tsunami modelling - elevation of area [PDF, 4.7 MB]

Map: Tsunami modelling - water flow depth [PDF, 5.2 MB]

Map: Tsunami modelling - water flow speed [PDF, 4.9 MB]

Map: Tsunami modelling - hazard classification [PDF, 5.1 MB]

 

Whiritoa

Scientific modelling of tsunami inundation in Whiritoa was completed in 2015 as a part of the Whangamata and Onemana assessment. The results of the assessment were presented in January 2015 at the annual community meeting.

Tsunami assessments

Managing tsunami risks in Whiritoa

Numerical Modelling of Tsunami Inundation at Whangamata, Whiritoa and Onemana, Coromandel Peninsula, New Zealand

Maps

These posters and following maps were on display at the tsunami open day in January 2015:

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

 

Pauanui and Tairua

Scientific modelling of tsunami inundation in Pauanui and Tairua was completed in 2012. Open days were held in Pauanui and Tairua in January 2014 to share the results with the community.

Tsunami assessments

Download a copy of Managing tsunami risks in Tairua and Pauanui.

Read Waikato Regional Council's technical report - Numerical modelling of tsunami effects at two sites on the Coromandel.

Maps

Map: Tsunami modelling - elevation of area

Map: Tsunami modelling - water flow depth

Map: Tsunami modelling - water flow speed

Map: Tsunami modelling - hazard classification

What the tsunami working group is suggesting

 

Firth of Thames/Coromandel Peninsula west coast

An assessment of the tsunami hazards along the west coast of the Coromandel Peninsula and in the Firth of Thames began in 2017/18. The assessment covers the communities of Colville, Coromandel, Manaia, Te Mata and Tapu, Waiomu, Te Puru and Ngarimu Bay, Thames and Kopu, Miranda, Kaiaua and Whakatiwai

Tsunami assessment

The scientific tsunami modelling report for all communities along the Firth of Thames/Coromandel Peninsula west coast was completed in March 2019.

Numerical Modelling of Tsunami Inundation in the Firth of Thames [PDF, 15 MB]

 

Summary reports

 

Colville

Tsunami summary Colville [PDF, 4.8 MB]

Coromandel

Tsunami summary Coromandel [PDF, 6.1 MB]

Manaia

Tsunami summary Manaia [PDF, 4.8 MB]

Te Mata and Tapu

Tsunami summary Te Mata and Tapu [PDF, 3.8 MB]

Waiomu, Te Puru and Ngarimu Bay

Tsunami summary Waiomu Te Puru Ngarimu Bay [PDF, 4.9 MB]

Thames and Kopu

Tsunami summary Thames [PDF, 7.9 MB]

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