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灾害 · 瓦努阿图地震

6.9级地震及多次震动后，瓦努阿图解除海啸预警

主震发生不到一小时后，区域海啸威胁便告结束。此后仍有反复地震，而经核实的沿海影响报告依然缺失。

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新闻追踪第 2 天

1 篇报道23 家媒体34 个来源

  1. 第 1 次更新6.9级地震及多次震动后，瓦努阿图解除海啸预警当前位置

据估计，10月24日瓦努阿图北部近海发生6.9级地震后，约有40,000人处于轻微震感区。这是受影响人口的模型估算，并非伤亡人数或房屋受损数量。区域海啸威胁现已解除，但反复地震对沿海社区造成的影响尚未得到核实。16 23

太平洋海啸预警中心最后一条区域消息的日期为03:28 UTC，距主震不到一小时。其事件页面随后显示“无海啸警告、建议、观察或威胁”。据《澳门商报》刊载的法新社报道，瓦努阿图地质灾害部门此前曾建议沿海居民转移到高处。取消预警是决定性的变化：没有依据将该区域预警描述为仍然有效。12 23 4

海啸威胁解除并不意味着地震序列结束。主震发生4分29秒后，又发生了一场独立的6.3级地震，之后还报告了许多次震动。同期报道未提及即时损失或伤亡，但有关人员受伤、建筑物和基本服务状况的经核实当地评估仍然缺失。“暂无即时报告”并不代表所有定居点都已确认安全。7 30 6

是两场地震，并非对主震震级的两种估算

经审阅的美国地质调查局记录显示，主震发生于2026年10月24日星期六当地时间13:31:28，即02:31:28 UTC。震中位于圣埃斯皮里图岛上的波特奥利西北偏西197公里处，震源深度10公里。报道所说的震中位于索拉以西约200公里，是以另一座参考城镇描述同一近海震中，并非另一场地震。11 9

还需要区分震级与事件数量。《德干纪事报》10月24日的报道仍采用初步的7.2级数据；1News当天报道的震级为6.9级，并指出7.2级是最初估算值。经审阅的美国地质调查局震级为6.9级。这些是对同一场地震的先后估算，并非两次强震。1 2 11

确实独立发生的第二场地震，其目录关联起始时间为02:35:57 UTC，记录震级为6.3级，震源深度10公里。一家次级追踪平台提供了这些详情，另一条独立地震记录证实了其起始时间和标识符。未能找到包含所有这些字段、可供核实的美国地质调查局目录记录。30 29

《观察者》还报道称，瓦努阿图气象与地质灾害部门对第二次地震给出的估值为6.5级，而美国地质调查局和欧洲-地中海地震中心给出的数值为6.3级。相应的国家级记录及其修订历史尚未得到确认。这一差异仍未解决，但不能据此将其计作第三场强震。7

从主震到区域解除警报

  1. 10月24日，02:31 UTC

    主震震级为6.9级，发生在瓦努阿图北部近海，当地时间13:31。

    11
  2. 10月24日，02:35 UTC

    记录为6.3级的独立地震随后发生；其精确起始时间为02:35:57 UTC。

    3029
  3. 10月24日，02:37 UTC

    首条区域海啸威胁消息发布。最初报道指出，震中300公里以内的瓦努阿图海岸可能遭遇危险海浪。

    249
  4. 10月24日，03:28 UTC

    最后一条区域消息发布；相关官方事件页面随后显示无海啸警告、建议、观察或威胁。

    1223

公告上的时间戳解释了另一处表面上的不一致。首条消息印出的时间为02:37 UTC，而非《观察者》反复提及的02:38。最后一条消息印出的时间为03:28；其传输标头和网页则显示较晚的时间戳。这些是与最后一条消息相关的不同时间戳，并不代表危险程度接连发生变化。24 7 12 23

海啸预警取消所能确认的事

最初的预警针对的是潜在危险，而非已确认的破坏性海浪。同期报道指出，距震中300公里以内的瓦努阿图海岸可能受到影响。有关取消预警的报道同时提醒，海平面仍可能出现轻微波动；区域中心也将本国警报级别和更具体的指示留给各国主管部门决定。9 7 12

地理位置也很重要。澳大利亚广播公司报道称，澳大利亚气象局没有发布海啸威胁。1News称，当时尚未划定新西兰受威胁区域；《每日论坛报》则报道，菲律宾地震学家建议菲律宾没有受到威胁，无需采取行动。这些针对特定国家的报道并未取消瓦努阿图面临的潜在危险；事件相关的完整国家级预警文本尚未经过独立核实。9 2 3

预测也不应被误当作水位测量值。据报道，一份模型估算的最大浪高为0.34米，另一份预测给出的初始海浪抵达圣埃斯皮里图岛的时间为03:01 UTC。这两项数值预测均未经过独立重新核实，也没有确定实际测得的沿岸浪高或实际抵达时间。缺少经过核实的观测结果，并不能证明没有海浪出现。10 7 26

反复震动，地面报告不完整

地震总数采用了不同的统计时段。《观察者》报道称，02:31至05:23 UTC这一分钟之前，至少发生了10次5.0级或以上地震。这包括主震和紧接其后的第二次地震，以及至少另外8次震动，并非主震之外还有10次余震。之后的一篇报道提到，截至06:58 UTC，发生了15次以上4.5级或以上余震，其中两次列为5.8级。后一个总数仍是报道所称的下限，且没有依据独立重建的事件清单。两组数字不能相加。7 12

最有力的受影响人口数据来自全球灾害预警和协调系统（GDACS）：约40,000人处于修订麦加利烈度IV级的范围内，即人们所在地点有轻微震感，而非地震的总体震级。GDACS将潜在人道主义影响评为低，主震的美国地质调查局自动影响警报也为绿色。两者评估的是可能影响，都不能取代实地核查。16 11

据报约有4,000人因紧接其后的第二次地震而受到轻微震感影响的估算，仍未得到证实。GDACS另有一项评估估算，后续一次5.8级地震使2,000人受到烈度III级或以上的震动影响。那涉及的是另一场地震和另一种震感阈值。它不会修正此前的估算；由于受影响人口可能重叠，也不能把这些数字相加，得出独立受影响人数总数。7 20

我们此前报道还有未解决的问题。10月20日，《HeyDay News》报道了另一场6.3级地震，震中位于波特奥利西北偏西204公里处，震源深度10公里。当时，该次地震对当地的影响及其相关海啸状况尚未确定。10月24日的地震序列是新的，其区域海啸预警取消并不能追溯性地解决此前的问题。欧洲-地中海地震中心的一条独立记录确认，10月20日发生的是一次独立地震。32

10月24日的地震序列所引发的区域海啸威胁已经结束。仍然缺少的是社区和地方当局提供的经核实情况：是否有人受伤，建筑物或基本服务是否受损，以及沿海仪器测得了什么。预警取消回答了一个紧急问题，但陆地上发生了什么，目前仍没有答案。

播出原貌 19 行
  1. Officials lifted Vanuatu's tsunami warning while further earthquakes shook the offshore region.
  2. On October 20, we reported a separate magnitude 6.3 earthquake near Port-Olry. This new sequence brought a magnitude 6.9 mainshock, followed less than five minutes later by a magnitude 6.3 earthquake. Coastal residents had been told to move to higher ground.
  3. What those new shocks did to coastal communities still isn't clear. The regional tsunami threat has ended, but people also faced repeated shaking. At the time of our earlier report, the October 20 earthquake's local impacts and tsunami status were still unclear.
  4. The mainshock struck 197 kilometres west-northwest of Port-Olry, at a depth of 10 kilometres. Port-Olry is on Espiritu Santo. Descriptions placing the quake about 200 kilometres west of Sola use another reference town for the same offshore epicentre.
  5. The earthquake struck early Saturday afternoon, October 24, in Vanuatu. Its precise origin was 1:31 p.m. local time. The reviewed magnitude is 6.9, replacing an initial estimate of 7.2. That change explains why different magnitudes still appear in accounts of the mainshock.
  6. The preliminary 7.2 estimate and the reviewed 6.9 describe one earthquake. The genuinely separate second shock came four minutes and 29 seconds later. Its listed magnitude is 6.3, and its listed depth is also 10 kilometres.
  7. Vanuatu's geo-hazards department has also been reported as putting that second shock at magnitude 6.5. That difference hasn't been resolved. The two estimates describe the reported second shock; they don't provide grounds for counting another large earthquake.
  8. The regional tsunami status now shows the threat has ended. The first threat message identified possible hazardous waves along Vanuatu coasts within 300 kilometres of the epicentre. The final regional message followed less than an hour after the mainshock.
  9. The first bulletin's printed time was 02:37 UTC, and the final bulletin's was 03:28 UTC. Later transmission and webpage timestamps refer to that final message. They don't describe successive changes in danger. Minor sea-level fluctuations could still occur, and national authorities set their own local alert levels.
  10. Vanuatu's geo-hazards department had advised coastal residents to seek higher ground while hazardous waves were possible. The cancellation ended the regional threat. That earlier advice addressed a potential danger before officials knew how the sea would respond.
  11. The initial threat was geographically limited. Australia's weather bureau said no tsunami threat had been issued for Australia. New Zealand wasn't identified as a threatened area at that stage. Philippine seismologists said there was no tsunami threat to the Philippines and no action was required there. Vanuatu's coasts were the concern.
  12. The early sequence count reached at least ten earthquakes of magnitude five or greater. That includes the mainshock and the second earthquake, plus at least eight further shocks. A later count described more than fifteen aftershocks at a lower magnitude threshold.
  13. The later count included two magnitude 5.8 shocks, along with a 5.7 and a 5.5. It also covered a longer period. Those different thresholds and stopping times explain why the totals differ. They don't give a combined aftershock total, and the later figure remains a reported lower bound.
  14. About 40,000 people were estimated to have experienced light shaking from the mainshock. The shaking model put them at intensity four on the Modified Mercalli scale. That measures shaking where people are, rather than the earthquake's overall magnitude.
  15. The humanitarian assessment rated the potential impact low, and the mainshock's automated impact alert was green. Both are assessments of likely effects. Local damage still requires checks on the ground. Voluntary felt responses also changed from three in an earlier snapshot to four later, as people submitted accounts of shaking.
  16. A separate estimate put about 4,000 people in light shaking from the immediate second earthquake. A later magnitude 5.8 shock had its own estimate of 2,000 exposed to intensity three or greater. Those populations may overlap, and the estimates use different shaking thresholds.
  17. The 4,000 estimate for the immediate second shock hasn't been confirmed. The later assessment concerns a different earthquake, so it doesn't replace that earlier estimate. The clearest supported exposure figure remains the mainshock model's estimate of about 40,000.
  18. A reported tsunami model estimated a maximum wave height of 0.34 metres. Another forecast gave an arrival time for Espiritu Santo. Both describe predicted conditions. We don't yet know what sea-level instruments measured along the coast.
  19. The regional warning has ended, while the sequence included numerous further earthquakes. No immediate damage or casualties were reported. A local impact assessment is still missing, so whether communities suffered injuries, damage or interruptions to essential services remains unclear.

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