The Tremor at the Observatory

The first tremor of the night was so small that Silvia logged it without lifting her eyes from her sandwich. The second came eleven minutes later, just as small, and the third eleven minutes after that. By the fourth she had put the sandwich down.

夜里的第一次震颤微弱得很，西尔维娅眼睛都没离开三明治，就把它记了下来。第二次在十一分钟后到来，同样微弱，第三次又隔了十一分钟。到第四次时，她已经把三明治放下了。

Alone on the night shift, with four screens, a kettle and a window in which the mountain showed as a darker piece of the dark, she watched the main trace. It drew its spikes like a comb laid on its side. Taken separately, none of them meant anything; the mountain made noises all the time. What bothered her was the regularity, and then, as the hours passed, the way the gaps between the spikes had begun to shrink: eleven minutes, then ten, then nine and a half.

夜班只有她一个人，面前是四块屏幕、一把水壶，还有一扇窗，窗外的山像是黑夜里更黑的一块。她盯着主记录曲线。曲线画出的尖峰，像一把横放的梳子。单独看，每一个尖峰都说明不了什么；这座山时时刻刻都在发出各种声响。让她不安的是那种规律性，而随着时间一小时一小时过去，尖峰之间的间隔又开始缩短：十一分钟，然后十分钟，然后九分半。

The forecasting model the observatory had adopted the previous spring put the chance of an eruption within three days at thirty-one percent, and showed this as a calm amber bar. Silvia had been taught to respect amber bars. She had also spent fourteen years learning the mountain's habits, and what the instruments were telling her looked less like noise than like something clearing its throat. The tilt meter on the western flank had shifted by a hair. The gas sensor above the upper vent had quietly stopped complaining, which it never did unless something below had changed.

天文台去年春天启用的预测模型，把三天内喷发的可能性定为百分之三十一，并以一根平静的琥珀色条形显示出来。西尔维娅从小受的教导，就是要尊重琥珀色条形。可她也花了十四年时间去熟悉这座山的脾气，而仪器此刻告诉她的，与其说是杂音，不如说像是什么东西在清嗓子。西部山腹的倾斜仪微微偏移了一点。上方火山口的气体传感器悄悄不再报警了，而除非下面有了变化，它从来不会这样。

Everything about the decision was uncomfortable. Two years earlier the observatory had advised evacuating Cold Spring, the village on the lower slope, for three days. Nothing had happened, the market week had been lost, and the following spring the open day, which once drew hundreds, drew eleven. People had been kind about it, in the way of people who have decided not to listen next time. Had she been wrong then too, Silvia wondered, or merely early? She would never know, and that was exactly the trouble with being right in advance.

做这个决定，每一点都让人不舒服。两年前，天文台建议山脚下的寒泉村疏散三天。结果什么也没发生，赶集周泡了汤，第二年春天的开放日，原本能吸引几百人，那次只来了十一个。大家都很客气，是那种已经决定下次不再听的客气。当时她是不是也错了呢，西尔维娅想，还是只是来得太早？她永远不会知道，而这正是提前做对的麻烦所在。

Not until she had written the sentence in the log, in plain words with no hedging, did she let herself ring the director. He was at a conference three time zones away and answered on the second ring. He heard her out. "The model says amber," he said. "What do you say?"

直到她把那句话写进日志，用平实的字眼，毫不含糊，她才允许自己给主任打电话。他正在三个时区之外开会，铃声响到第二下就接了。他听她把话说完。“模型说是琥珀色，”他说，“你怎么说？”

"I say that if the pattern holds for another hour, I want the village out by morning." She heard the sentence as she spoke it and did not take it back. "If I'm wrong, I'll write the apology myself."

“我说，如果这个规律再保持一小时，我想在天亮前让村子里的人撤出来。”她听着自己说出的这句话，没有收回。“如果我错了，道歉信我自己来写。”

"Then that's the recommendation," said the director. "Make the call."

“那就按这个建议办，”主任说，“打电话吧。”

The civil protection officer asked her twice whether she was sure, then said nothing for a long moment, and then said, "Understood." By five o'clock the first buses were idling beside the village hall with their lights on. Silvia watched them on the camera feed: people in coats carrying children, and cats in boxes, up the steps, without anyone seeming to hurry. Had she waited for the model to turn red, she would have lost the one thing an evacuation cannot do without, which is time.

民防官员问了她两遍是否确定，然后沉默了很久，接着说：“明白了。”到五点钟，第一批大巴已经开着灯停在村会堂旁边。西尔维娅在监控画面里看着：穿着外套的人抱着孩子，还有装在盒子里的猫，一个接一个上了台阶，却没有人显得慌张。要是她等模型变红，就会失去撤离绝对少不了的那样东西，也就是时间。

The day shift arrived at six and stopped taking off their coats when they saw the screens. The gaps were down to seven minutes. Nobody said what it would mean if they went on shrinking, and nobody said what it would mean if they stopped.

白班的人六点到了，一看见那些屏幕，连外套都忘了脱。间隔已经缩到七分钟。没有人说如果它继续缩短意味着什么，也没有人说如果它停下来又意味着什么。

At twenty past, the line went flat. Silvia looked at the clock and then, deliberately, away from it. She began to count. Four minutes passed, then five, then six, and behind her not one person spoke.

六点二十分，曲线变平了。西尔维娅看了一眼时钟，然后有意地把目光移开。她开始数数。四分钟过去了，五分钟，六分钟，她身后一个人也没有出声。