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Correlation between seismic events and anomalous VLF day-length for west-east and east-west propagation paths

机译：西部地震事件与异常VLF日长度的相关性

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We present results of year-long analysis of VLF signals, both for VTX-Malda (west-east propagation path) and VTX-Pune (east-west propagation path). We analyzed whole year data of 2008 and 2009 for VTX-Malda and VTX-Pune propagation path, respectively. In both the cases we found that VLF day-length (defined as time difference between sunset terminator time and sunrise terminator time) became anomalously high 1–2 days before an earthquake. Besides this year-long study we have also done some case by case analysis. On 9th January, 2009 an earthquake of magnitude 5.5 occurred at Carlsberg Ridge (latitude 10.3° N, longitude 57.1° E). In a separate incident, on 3rd November, 2009, another earthquake of magnitude 5.4 occurred at Andaman Islands (latitude 14.1° N, longitude 93.1° E). We analyze VLF signals for VTX-Pune (east-west propagation path) propagation path around these two earthquake days and found that for both of these cases, the VLF-day-length became anomalously high two days before the event. This agrees well with statistical analysis based on year-long data for VTX-Pune path. Furthermore, during time period of June, 2010, two major earthquakes of low-depth (10Km) and high magnitude (M > 5) occurred near NWC-Salt Lake (east-west propagation path) propagation paths. First one occurred on 13th June, 2010 at Nicobar Islands, India (latitude 7.8° N, longitude 92.0° E). Its magnitude was 5.1 (in Richter scale). The second one of magnitude 6.0 (in Richter Scale) occurred on 19th June, 2010 at Andaman Islands, India (latitude 13.4° N, longitude 93° E). For both of these two earthquakes, we found that VLF-day-length, became anomalously high one day before earthquakes. We claim that these were pre-cursors of the earthquakes which occurred in Andaman and Nicober Islands.
机译：我们对VTX-MALDA（西东传播路径）和VTX-PUNE（东西 - 西传播路径）的VLF信号分析了对VLF信号的一年分析的结果。我们分析了2008年和2009年的全年数据，分别为VTX-MALDA和VTX-Pune传播路径。在两种情况下，我们发现VLF天长（定义为日落终止时间和日出终止符时间之间的时间差）在地震前1-2天变得异常高。除了今年长期的学习，我们还通过案例分析进行了一些情况。 2009年1月9日在Carlsberg Ridge（纬度10.3°N，57.1°E）上发生了幅度5.5的地震。在2009年11月3日的一个单独事件中，Andaman群岛（Latitude 14.1°N，经度93.1°E）发生了另一个级别的5.4级。我们分析VTX-Pune（东西 - 西方传播路径）传播路径的VLF信号，并发现对于这两种情况，VLF日长度在事件前两天大致高。这与基于VTX-Pune路径的年长数据进行统计分析。此外，在2010年6月期间，在NWC-盐湖（东西 - 西方传播路径）传播路径附近发生了两大地震（10公里）和高幅度（M> 5）。第一个发生在2010年6月13日，在印度尼科尔群岛（纬度7.8°N，经度92.0°E）。它的幅度为5.1（在Richter Scale）。第6.0级（Richter Scale）的第二级（在Richter Scale）于2010年6月19日在Andaman Islands，印度（纬度13.4°N，经度93°E）。对于这两种地震两种，我们发现VLF日长度，在地震前一天变得异常。我们声称这些是Andaman和Nicber群岛发生的地震的前料。

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