2016年的一天深夜，位于美国俄勒冈州波特兰市40千米处的格罗夫小镇，突然响起一阵巨大的呜呜声。居民们被怪声吵醒，各家的狗狂吠不止。第二天醒来后，大多数人都已经忘记了前一晚的巨响。让人没想到的是，第二天深夜，巨大的声音又传来，声音与前一晚类似。

之后的几个月里，这些噪音经常在夜晚出现，但是声音并不都一样，有时如尖叫声，有时又是呜呜声，有时则类似汽车刹车的刺耳的声音,还有的类似汽笛声，或金属互相摩擦的声音，有时听起来又像是人的呻吟声或嚎叫声。这些怪声出现的具体时间没有规律，大部分出现在深夜。出现的地点也不固定，声音的音量经常是由小到大再到小，就像是声源从远处靠近又向远处运动一样。尽管每次怪声只响几分钟，但是夜深人静时突然传来这样尖锐刺耳的噪音把小镇搅得鸡犬不宁，严重影响了人们的生活。

找不到来源的怪声音

这是什么声音呢？当地一个音响工程师分析了那些声音，认为那是被压迫的空气或者天然气被释放时的声音。但是经过排查，小镇各处没有燃气泄漏散发的刺鼻气味，周围的天然气管道也没有破裂的情况，因此排除了怪声来自燃气泄漏的可能。由于声音听起来总是有一个由远到近、又从近到远的过程，因此有人怀疑那可能是行驶中的交通工具发出的声音，怀疑对象包括消防车，还有小镇附近火车轨道上运行的火车。但是消防部门证实声音出现时，没有消防车被派出，而小镇附近的铁轨很少使用，并且火车的声音与怪声不一样。

美国加利福尼亚州太平洋大学的一位物理学教授想到了一个追踪怪声的方法。他向民众收集信息，将每个人听到怪声时的地点、时间标注在谷歌地图上，然后试图从地图上找出怪声出现的时间和地点上的规律。但是他发现声音出现的时间和地点似乎都是随机的，最终他也没得出什么结果。

一些人将怪声录音并上传到了互联网，引来了许多关注，还被美国的一些知名媒体报道，很快就成了当时网络上人们热议的话题。网友们纷纷提出自己的看法，有人说那声音是外星人的飞船发出的，有人说小镇上有鬼魂或恶魔在游荡，那些奇怪的声音可能是他们出现时发出的声音，还有人将怪声与其他超自然现象联系在了一起。不过这些都只是网友们的猜测，格罗夫小镇怪声之谜仍然没人能解答。

奇怪的是，就在这个现象名声大噪之时，怪声却突然消失了。这又是怎么回事？怪声更加神秘了。

制造罪恶的声音

就在大家对怪声摸不着头脑的时候，有人提出了一个观点——怪声可能是犯罪分子生产大麻油时发出的声音。大麻油是大麻植物的浓缩液体提取物。大麻油中的主要成分有四氢大麻酚（THC），能使人精神亢奋，给人带来“快感”，长期服用会让人成瘾。虽然在美国的一些州吸食娱乐性大麻是合法的，但是生产大麻油却是受限制的。

2016年，有些不法分子在小镇及周边疯狂生产大麻油。在生产过程中，他们将液态的丙烷（也可以用丁烷）泵入装有大麻植物的容器中，经过过滤、蒸发等过程得到大麻油。而在生产大麻油时，制备的设备与装有丙烷的罐子上的金属管之间由一条管子连接，以保证丙烷的持续供应。当生产工作结束时，连接丙烷罐的管子会被拔掉，此时罐子中残留的丙烷会快速从金属管逃逸出来。罐中的丙烷是被压缩成液态的，而丙烷在常压下会很快变成蒸汽，因此在罐内压力的压迫下，残留的丙烷快速流出金属管，在这个过程中液态丙烷很快就变成蒸汽。当丙烷蒸汽快速流过金属管时，撞击管壁，从而发出尖锐的声音。

这个原理与我们吹哨子相似。我们向哨子内吹气，空气在哨子内形成一个快速回旋的气流，高速气流从哨子出气口出来时，与哨子壁摩擦，使哨子内壁振动，从而发出声音。

怪声来自生产大麻油的过程这个说法不仅有科学依据，而且有人似乎还发现了一些证据。有人注意到，怪声出现之前，格罗夫小镇或附近的小镇经常很巧合地出现丙烷盗窃案。这是否意味着，怪声可能与丙烷有某种联系呢？此外，有人提出，非法生产大麻油是违法的，不法分子为了躲避警察的追踪，选择在夜晚，在移动的车辆上进行生产似乎是最好的办法。而怪声在被广泛关注之后就突然消失了，这似乎说明不法分子可能害怕被发现，选择了暂避风头或者转移了生产地点。

看来，怪声来自大麻油生产的过程是最合理的解释了，但是这个解释也只是一个推论，没有有力的证据证明。看来，要给出俄勒冈怪声之谜的终极解答，还需要更多证据。

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