克罗地亚地震目录中地震的本地震级(ML)和矩震级(Mw)之间的转换

Pub Date : 2020-12-23 DOI:10.15233/gfz.2020.37.10
M. Herak
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引用次数: 6

摘要

根据《克罗地亚地震目录》中列出的153次地震(1959–2020),获得了全球和区域机构报告的当地震级ML、CR和相应矩震级Mw之间的转换关系。由于两个变量都存在误差,因此使用了York回归。最佳拟合线为:MwL=(-0.106±0.122)+(1.002±0.027)ML,CR(决定系数R2=0.90)。考虑的地震发生在克罗地亚及其邻近地区,其当地震级ML,CR在3.5至6.5之间。残差分析表明,20世纪80年代初可能发生了高达0.3个震级单位的人为正震级偏移,当时Wiechert机械地震仪被具有速度比例记录的仪器所取代,而没有对震级公式进行适当的重新校准。回归的斜率接近1.0,表明断层的纵横比(宽度/长度)平均约为1/2。
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Conversion between the local magnitude (ML) and the moment magnitude (Mw) for earthquakes in the Croatian Earthquake Catalogue
Based on 153 earthquakes (1959–2020) listed in the Croatian Earthquake Catalogue, a conversion relation was obtained between the local magnitude ML,CR and the corresponding moment magnitude Mw as reported by the global and regional agencies. As errors were present in both variables the York regression was used. The best fit line is given by: MwL = (–0.106 ± 0.122) + (1.002 ± 0.027) ML,CR (coefficient of determination R2 = 0.90). The earthquakes considered occurred in Croatia and the neighbouring regions, and their local magnitudes ML,CR ranged between 3.5 and 6.5. Residual analysis suggests that an artificial positive magnitude shift of up to 0.3 magnitude units may have occurred in the early 1980s, when Wiechert mechanical seismographs were replaced by the instruments with velocity proportional recordings without proper recalibration of the magnitude formula. The slope of the regression close to 1.0 indicates that on the average the faults’ aspect ratio (width/length) is about 1/2.
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