In the last two decades, New Zealand (NZ) has experienced significant earthquakes, including the 2010 M 7.2 Darfield, 2011 M 6.2 Christchurch, and 2016 M 7.8 Kaikōura events. Amongst these large events, tens of thousands of smaller earthquakes have occurred. While previous event and ground-motion databases have analyzed these events, many events below M 4 have gone undetected. The goal of this study is to expand on previous databases, particularly for small magnitude (M<4) and low-amplitude ground motions. This new database enables a greater understanding of regional variations within NZ and contributes to the validity of internationally developed ground-motion models. The database includes event locations and magnitude estimates with uncertainty considerations, and tectonic type assessed in a hierarchical manner. Ground motions are extracted from the GeoNet FDSN server and assessed for quality using a neural network classification approach. A deep neural network approach is also utilized for picking P and S phases for determination of event hypocentres. Relative hypocentres are further improved by double-difference relocation and will contribute toward developing shallow (< 50 km) seismic tomography models. Analysis of the resulting database is compared with previous studies for discussion of implications toward national hazard prediction models.
Hon JUDITH COLLINS to the Prime Minister: Does she stand by all her Government’s statements and actions?
HELEN WHITE to the Minister of Finance: What recent reports has he seen on the New Zealand economy?
Hon PAUL GOLDSMITH to the Minister of Education: Does he stand by all his statements and policies on education?
GINNY ANDERSEN to the Minister of Housing: What recent announcements has she made about the Government’s transitional housing programme?
NICOLA WILLIS to the Minister of Housing: Has the Government kept the commitment made in the 2017 Speech from the Throne to develop a ‘Rent to Own’ scheme; if so, how many families has the scheme helped into houses since then?
ANAHILA KANONGATA'A-SUISUIKI to the Minister for Social Development and Employment: What support has the Ministry of Social Development provided to people and families affected by recent COVID-19 restrictions?
NICOLE McKEE to the Minister of Police: Will Government actions reduce gang crime and gang numbers this year?
IBRAHIM OMER to the Lead Coordination Minister for the Government's Response to the Royal Commission's Report into the Terrorist Attack on the Christchurch Mosques: What recent engagement has there been with the Muslim and other ethnic communities on the Royal Commission of Inquiry into the terrorist attack on Christchurch masjidain?
SIMEON BROWN to the Minister of Police: Does she stand by her commitment to achieve the Striving Towards 1800 New Police initiative; if so, when will she achieve this initiative?
TEANAU TUIONO to the Minister for Economic and Regional Development: What advice, if any, has he received about the upcoming launch in New Zealand of a satellite that includes the “Gunsmoke-J” payload from the United States Army’s Space and Missile Defense Command?
MARJA LUBECK to the Minister for Workplace Relations and Safety: What recent announcements has he made about improving the Holidays Act 2003?
TIM VAN DE MOLEN to the Minister for Building and Construction: How many applications has the Residential Earthquake-Prone Building Financial Assistance Scheme had since its inception in September last year, and how much has been appropriated for the scheme?
