美國海嘯預警系統表示，德瑞克海峽（Drake Passage）地區於台灣時間上午10時16分，發生規模8地震後，未發布海嘯警報。路透報導，美國地質調查所（USGS）表示，今天上午一場規模7.5地震侵襲德雷克海峽。地震規模由原本的規模8下修為7.5。德雷克海峽位於南美洲南端和南極洲之間。美國地質調查所表示，地震深度為11公里。

智利海軍水文與海洋學局一度對智利南極領土發布海嘯預防警報。太平洋海嘯警報中心稍後表示，德瑞克海峽地震的海嘯威脅已經解除。根據美國地質調查所數據，這次地震震央位於阿根廷南端城市烏斯懷亞（Ushuaia）東南方超過700公里處。烏斯懷亞人口約5.7萬人。

Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)

本文來自: https://www.chinatimes.com/realtimenews/20250822001899-260408
The Log Periodic Antenna  as known as LPDA  is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
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