新国家标准震级标度与传统震级标度对比研究

使用四川省地震台网2013年4月以来的宽频带数字地震资料，对新国家标准震级标度与传统震级标度中的4类震级进行了对比分析。结果表明:新M_L与传统M_L、M_S（BB）与M_S7之间的差别最小，相关性最高；所有事件的新m_b均大于或等于传统m_b；大部分事件的新M_L大于传统M_L；m_B（BB）大于m_B的事件多于m_B（BB）小于m_B的事件；M_S（BB）小于M_S7的事件数量与M_S（BB）大于M_S7的事件接近；新M_L较传统M_L更符合区域地质实际状况，新m_b较传统m_b更便于测量，M_S（BB）较M_S7、m_B（BB）较m_B更适应当前的宽频带数字地震资料，其测定结果更稳定。新国家标准震级标度充分考虑了我国震级测定的历史连续性，很好地继承和衔接了传统震级标度，在可操作性和资料适用性方面有极大提高。 

Comparison of the new national standard magnitude scales with the traditional magnitude scales

The new national standard magnitude scales and traditional magnitude scales are analyzed by using broadband seismic data from Sichuan seismic network science April of 2013. The results suggest that the differences between the new and the traditional M_L, and the M_S（BB） and M_S7 are small, hence, they are the high correlated. The new m_b is greater than or equal to the traditional m_b for all events, while the new M_L is greater than the traditional M_L for most events. In addition, the M_S（BB） is less than the M_S7 for half of the events. Moreover, the new M_L is more suitable in the actual regional geological condition compared with the traditional one, the new m_b is easier to measure, the M_S（BB） and m_B（BB） are more stable and adapt to the current broadband digital seismic data. Therefore, the new national standard magnitude scale not only has a good continuity of magnitude determination, but also has been greatly improved in terms of operability and applicability.