跳到主要內容區塊
Close
:::
Open
  1. HomeHome
  2. > Research

Research Results

:::
2024-06-26
  • Research Findings
  • Institute of Earth Sciences
Antigorite’s anisotropy impacts seismicity of intermediate-depth earthquakes

In some subduction zones, intermediate-depth earthquakes (~70–300 km depth) occur along two separate planes, known as double seismic zones. The subduction system in eastern Taiwan has a similar feature with shallower double seismic zone. Mechanisms forming such intriguing seismicity, however, remain inconclusive. The research, led by Dr. Wen-Pin Hsieh, Research Fellow at the Institute of Earth Sciences, Academia Sinica, has precisely measured the thermal conductivity of antigorite, an important serpentine mineral in subducting slabs, at high pressure-temperature conditions along slab subduction. The study demonstrated that antigorite has a strong thermal conductivity anisotropy. Combined with numerical modeling on slab’s thermal evolution, the team further showed that such strong thermal conductivity anisotropy combined with shear-induced crystal-preferred-orientation creates a thermal blanket effect that suppresses heat flow, significantly affecting slab’s thermal evolution and promoting dehydration embrittlement. Meanwhile, such effect also facilitates thermal runaway, a positive feedback accumulating heat, to trigger intermediate-depth earthquakes. These exciting findings highlight the important role that hydrous minerals play on the thermal state of a slab and the fundamental mechanisms triggering deep earthquakes. This research has been published on June 18, 2024 in Nature Communications. The first author of this research, Yu-Hsiang Chien, is a PhD candidate of TIGP-ESS at Academia Sinica, and coauthors include Yi-Chi Tsao of IES, and Dr. Enrico Marzotto of GeoForschungsZentrum (GFZ), Germany.

2024-06-11
  • Research Findings
  • Institute of Cellular and Organismic Biology
Earthquakes Shake up Kueishan Island: Spatiotemporal Uncovering the Secrets of Shallow-water Vent Discharge and Its Interplay with Surrounding Marine Habitats

Hydrothermal vent systems are thought to be the most like the sites on Earth where life began. The shallow-water hydrothermal vent system on Kueishan Island offers marine biologists an exceptional research possibility. Dr. Yung-Che Tseng (Institute of Cellular and Organismic Biology) and Dr. Tzu-Hao Lin (Biodiversity Research Center) took advantage of the Marine Research Station to establish comprehensive research tactics that included marine physicochemical, biological, and soundscape aspects of the hydrothermal vent systems. For the first time, they carefully tracked, over a two-year period and across multiple habitats (including the venting system and surrounding coral reef ecosystems). The research team's findings reveal that shallow earthquakes in close proximity to the vent sites trigger periodic changes in hydrothermal discharge, resulting in significant fluctuations in pH levels, dissolved inorganic carbon, and sulfide concentrations during active venting periods. These variations in physicochemical conditions, in turn, influence the soundscapes of the surrounding marine habitats. Remarkably, the environmental characteristics exhibit notable differences between various geologically active periods, underscoring the complexity of hydrothermal vent impacts. Furthermore, the study suggests that even distant coral ecosystems may be indirectly affected by hydrothermal activity through seasonal changes in soundscapes. These discoveries provide insight into the origins of life and the evolution of early Earth settings facilitated by hydrothermal vent systems, as well as novel perspectives on monitoring and conserving extreme marine ecosystems. The study report was published in Limnology and Oceanography Letters in May 2024, with the co-first author being Ling Chiu (Ph.D. candidate at the Institute of Oceanography, National Taiwan University) and Dr. Min-Chen Wang (Institute of Physiology, Christian-Albrechts-University Kiel). The Academia Sinica's Development Award Project, the Marine Research Station, and the National Science and Technology Council provided funding for the study.

2024-06-07
  • Research Findings
  • Institute of Cellular and Organismic Biology
Whole-body Replacement Mechanism Generates Adult Muscle Tissues in the Zebrafish Model

Certain insects, like beetles and butterflies, can undergo massive tissue replacement during their development, a transformation process considered unique to insects. Compared to insects, vertebrates exhibit relatively limited changes in appearance during post-embryonic development. Nonetheless, at the cellular level, whether similar drastic changes occur akin to those observed in insect development remains an unexplored research topic. Dr. Chen-Hui Chen and his team at the Institute of Cellular and Organismic Biology (ICOB) created the palmuscle myofiber tagging and tracking system for in toto monitoring of the growth and fates of ~5000 fast myofibers in developing zebrafish larvae. They found that zebrafish, as a vertebrate model, can similarly undergo complete muscle elimination and replacement during post-embryonic development. Due to limitations in research tools, past studies on vertebrate muscle cells have primarily focused on cell culture models or histological investigations. This study may represent the first instance of simultaneously and continuously observing all muscle cells within an individual at both the organismal and cellular levels. This study finding challenges the current understanding of vertebrate development. This unexpected finding was published in June this year in the EMBO J. The first author, Uday Kumar, is affiliated with the Taiwan International Graduate Program, jointly administered by Academia Sinica and National Chung-Hsing University. Other team members include Chun-Yi Fang, Hsiao-Yuh Roan, Shao-Chun Hsu, Chung-Han Wang, and Chen-Hui Chen. This study is supported by funding from the Institute of Cellular and Organismic Biology and grants from Academia Sinica to C.-H.C. (AS-CDA-109-L03 and AS-GCS-112-L01); and grants from National Science and Technology Council, Taiwan, to C.-H.C. (NSTC 110-2628-B-001-016, and NSTC 111-2628-B-001-026).

  • :
  • /324