A recent seismological study has revealed that wide fault zones act like ‘earthquake highways,’ accelerating the propagation of seismic energy. While conventional models assumed earthquakes rupture primarily along narrow, well-defined faults, new research shows that complex fault zones several kilometers wide can significantly speed up earthquake rupture. Using high-resolution seismic imaging and numerical simulations, scientists found that these broad fault zones contain fractured, loosely compacted rocks with low frictional resistance, allowing seismic waves to travel more efficiently. This mechanism helps explain why some earthquakes exceed expected magnitudes and cause unexpectedly widespread damage. For instance, the 2011 Tohoku earthquake in Japan and the 2016 Kaikōura earthquake in New Zealand both involved ruptures across interconnected networks of multiple fault segments. Researchers emphasize that incorporating wide fault zones into seismic hazard models can improve predictions of earthquake likelihood and potential impact. This discovery not only advances our understanding of earthquake dynamics but also provides crucial insights for urban planning and disaster preparedness.
近期一项地震学研究发现，宽大的断层带在地震传播过程中扮演着类似‘高速公路’的角色。传统观点认为，地震破裂主要沿狭窄的主断层发生，但新研究表明，宽度可达数公里的复杂断层带能够显著加速地震能量的传播。研究人员通过高分辨率地震成像和数值模拟发现，这些宽大断层带内部结构松散、岩石破碎，摩擦阻力较低，使得地震波能更高效地穿越，从而加快破裂速度并扩大影响范围。这一机制有助于解释为何某些地震的震级远超预期，且破坏范围异常广泛。例如，2011年日本东北大地震和2016年新西兰凯库拉地震中，破裂过程都涉及多个相互连接的断层段，形成了复杂的‘断层网络’。科学家指出，将宽大断层带纳入地震风险评估模型，可提升对强震发生概率和潜在破坏力的预测准确性。该发现不仅深化了对地震动力学的理解，也为城市规划与防灾减灾提供了新的科学依据。
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