AI 中文总结
研究发现反相似地震在哥伦比亚、阿拉斯加、罗马尼亚等中深震区存在，结合日本、智利的观测表明其可能是中深地震活动的常见过程，或由共轭或近平行断层形成。
AI 中文摘要
反相似地震是指波形近乎相同但翻转的地震，至今仍属罕见观测。本文记录了3处发生这类地震的中深源区域：第一处为哥伦比亚，包括已确认的布卡拉曼加巢反相似震源，以及哥伦比亚瓦达蒂-贝尼奥夫带其他中深震群的新观测；第二处为阿拉斯加俯冲带；第三处为罗马尼亚弗朗恰地震巢。结合日本、智利的相关报告，新观测提供了越来越多证据，表明反相似地震序列可能是中深地震活动的常见或特征过程。榴辉岩化诱导应力促成的共轭断层，或近平行断层，可解释其在这些深度的发生。对其他活跃中深震区的细致观测，或能揭示反相似地震更广泛的地理分布，并为其潜在机制提供更严格约束。
英文摘要
Anti-similar earthquakes, those with nearly identical but flipped waveforms, remain an uncommon observation. We document three locations where these events occur at intermediate depth. The first of these is Colombia, including the well-established source of anti-similar events in the Bucaramanga Nest, and new reports in other intermediate depth seismicity clusters in the Wadati-Benioff zones of Colombia. The second is the Alaska subduction zone, and the third is the Vrancea seismic nest in Romania. These new observations, combined with reports from Japan and Chile, provide mounting evidence that anti-similar earthquake sequences might be a common or characteristic process of intermediate-depth seismicity. Either conjugate faulting promoted by eclogitization induced stresses or sub-parallel faulting can explain their occurrence at these depths. Careful examination of seismicity in other productive intermediate depth seismicity zones might reveal an even more widespread geography for anti-similar earthquakes and place tighter constraints on their underlying mechanism.
