Analysis of Non-Double-Couple Components
Earthquake fault slip is commonly described by a double-couple source model.
However, some earthquakes exhibit anomalous components known as
non-double-couple (non-DC) components.
To better understand earthquake source processes and subsurface structure,
we analyze non-double-couple components using waveform data recorded by
ocean-bottom seismometers (OBSs).
Non-Double-Couple Components in Aftershocks of the 2024 Noto Peninsula Earthquake
In the aftershock sequence of the 2024 Noto Peninsula earthquake, several events exhibited significant non-double-couple components. We analyze their waveform data in detail to investigate the characteristics and possible origins of these components.
Figure 1: Estimated focal mechanisms of aftershocks of the Noto Peninsula earthquake, including non-double-couple components.
References
- Akuhara, T., Shinohara, M., Yamada, T., Azuma, R., Hino, R., Obana, K., et al. (2025). Non-double-couple components of the 2024 Noto earthquake aftershocks: influence on focal mechanism estimation. Earth, Planets and Space, 77(1). https://doi.org/10.1186/s40623-025-02279-6