Work

Spatiotemporal evolution of long-term slow slip events at the Hikurangi subduction zone, New Zealand (2021–2023): Implications for seismic activity

Year: 2025

Type: article

Abstract: Various slow slip events (SSEs) with distinct characteristics have been detected globally, particularly in regions with dense Global Navigation Satellite Systems (GNSS) networks. In the Hikurangi subduction zone of New Zealand, SSEs frequently occur alongside seismic activity, especially in the Manawatu and Kapiti regions. This study analyzes the 2021–2023 Kapiti-Manawatu long-term SSE using daily displacement data (2019–2023) from 53 GPS stations. The network inversion filter (NIF) method is applied to extract slow slip signals, revealing spatial migration with alternating slip between Kapiti and Manawatu, characterized by distinct phases of acceleration and deceleration. Manawatu exhibits higher slip rates, exceeding 4 cm/month, with greater cumulative slip and surface displacement than Kapiti. A moderate temporal correlation (coefficient 0.59) between seismic activity in the region and slip acceleration in Manawatu suggests that seismic events may contribute to the slip, while no significant correlation is observed in Kapiti.

Source: Geodesy and Geodynamics

DOI: 10.1016/j.geog.2024.12.001

Authors: Li Yan, Yanling Sun, Meng Li, Ahmed El-Mowafy, Tieding Lu

Institutions: Curtin University, East China University of Technology, Guangzhou City University of Technology

Language: English

Topic: earthquake and tectonic studies

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: diamond

Funders: Ministry of Natural Resources of the People's Republic of China, National Natural Science Foundation of China, Ministry for Business Innovation and Employment, GNS Science

Awards: G3104015535, G4818609613, G7493490697