八条短答，资料截至 。每条先给一句直接结论，再写出处。伤亡只引用带日期的公报，不合成全球总数。
问答
这是地震吗？
不是构造地震。美国地质调查局事件 us7000tbwb 已审定为 M5.2 滑坡/崩塌，深度 0.0 km。信号出现于 （尼泊尔 08:37，北京时间 10:52），当天曾初报为 M4.4 地震。USGS 在 的要点写明：分析长周期波、邻近台站和卫星影像后，能量来自冰川崩塌与碎屑流，没有发生构造地震。约三小时后还有第二次滑坡信号 us7000tc90（约 M4.2，），与第一次崩塌的地面关系截至 8 月 28 日官方页未说明。
Was this an earthquake?
No. USGS event us7000tbwb is a reviewed M5.2 landslide, not a tectonic earthquake. The signal at on 26 August 2026 was first issued as M4.4. Later analysis of long-period waves, nearby stations, and satellite images showed the energy came from a glacial collapse and debris flow. USGS Key Points updated at 18:44 UTC that day state no earthquake had occurred. A second landslide signal, us7000tc90 about M4.2, was recorded at ; its ground relationship to the first collapse remains unpublished.
USGS 记录的时间是哪一刻？
USGS 审定原点是 。对应尼泊尔时间 08:37、北京时间 10:52。USGS 要点也写作当地上午 8:37。路透引德国地学研究中心（GFZ）称，吉隆监控里泥石流击中口岸大约比这个原点晚 7 分钟，和河谷传播时间相符。中方报道里吉隆约北京时间 10:30 受击，和原点对不上，当作未核实。现场到达时间以监控为准更稳妥，不要把几套钟混成一条时间线。
What time did USGS record?
USGS origin time for us7000tbwb is on 26 August 2026. That is 08:37 Nepal Time and 10:52 China Standard Time. USGS Key Points say 8:37 AM local time. Reuters, citing GFZ, put the Gyirong CCTV strike about seven minutes after the seismic origin, which matches travel time down the valley. Chinese reports of about 10:30 CST at Gyirong Port do not match the USGS origin and remain unverified. Use the reviewed origin clock and the CCTV arrival, not mixed clocks.
该用哪一组坐标？
三个点回答三个问题，不能合成一个坐标。渡边英德用 PlanetScope 加 Landsat 把冰舌崩塌定在 28.2877°N, 85.52723°E。USGS 把 us7000tbwb 定在 28.271°N, 85.515°E，来自卫星定位，落在朗塘利隆北壁约 5500 m，不是谷底流路。路透视觉核验的吉隆口岸监控是 28.2803°N, 85.3776°E。社交账号上另有相差数百米的钉子。本站每个标签只跟自己的出处，红线不把 USGS 点连进河道。
Which coordinates should I use?
Three published points answer different questions and must not be merged. Watanabe Lab placed the ice-tongue collapse at 28.2877°N, 85.52723°E using PlanetScope and Landsat. USGS located us7000tbwb at 28.271°N, 85.515°E from satellite imagery; that point sits on the north face of Langtang Lirung, not on the valley floor. Reuters visual verification put Gyirong Port CCTV at 28.2803°N, 85.3776°E. Other social-media pins can sit hundreds of metres away. This site keeps each label on its own source.
洪水走了哪条河谷？
碎屑从冰舌向西北落入错坚河 / 郭巴峡曲，约在 28.33°N 汇入伦德河（东林藏布 / Lhende Khola），再进波特科西–特里苏里。涌浪先打中吉隆口岸和热索桥，再向南经过提姆里、夏布鲁贝西、哈库贝西、麦隆、贝特拉瓦蒂、德维加特、加尔奇、穆格林。USGS 写碎屑流与洪水沿河约 100 km。尼泊尔水文预报部门称，涌浪进入尼泊尔后约 10 小时到德维加特。本站红线是 OSM 河谷中线，不爬朗塘山脊，也不经过敦切县城。
What path did the flood take?
Debris fell northwest from the ice tongue into the Chhochen / Guobaxiaqu valley, then joined the Lhende Khola (Donglin Zangbo) near 28.33°N before entering the Bhotekoshi-Trishuli system. The surge hit Gyirong Port and Rasuwagadhi, then Timure, Syabrubesi, Haku Besi, Mailung, Betrawati, Devighat, Galchhi, and Mugling. USGS described about 100 km of debris flood along those rivers. Nepal’s flood office said the wave took about ten hours inside Nepal to Devighat. The red line follows OSM river centreline and does not climb Langtang’s ridge or Dhunche town.
吉隆口岸灾前灾后在哪看？
在首页胶片条点开「吉隆口岸高清」。那一组滑杆用的是 Wikimedia Commons 吉隆口岸左右对照（ 上传，本地裁成灾前/灾后两张）。地点就是路透核验的 28.2803°N, 85.3776°E，不要和北面约 15 km 的吉隆镇搞混。同一口岸还有 Planet SkySat 约 0.80 m（）和 Pelican 约 0.55 m（），许可是 CC-BY-NC。三维图上可叠 Vantor 灾前和 灾后瓦片。
Where can I see Gyirong before and after?
Open the homepage filmstrip and choose the pair titled 吉隆口岸高清. That slider uses a Wikimedia Commons left-right pair of Gyirong Port uploaded on and stored here as local chips. The same place is 28.2803°N, 85.3776°E. SkySat at about 0.80 m () and Pelican at about 0.55 m () also cover the border, under Planet’s CC-BY-NC terms. Vantor OpenAerialMap tiles from 16 October 2021 and 27–28 August 2026 drape the 3D map at the crossing.
Planet 影像是什么许可？
Planet 这次危机响应影像的许可是 CC-BY-NC-4.0：必须署名，只准非商业使用。目录在 Source Cooperative 的 STAC：planet/disasterdata/nepal-flash-flood-2026-08-26。本站没有把 Planet 像素当成公有领域拷走。胶片条缩略图和 OpenAerialMap 瓦片只用于非商业对照，并保留署名。目视请用 visual 资产。灾前 PlanetScope 是表面反射，灾后是 TOA 辐射，不能直接做未校正的光谱差分。
What is the Planet license?
Planet Crisis Response scenes for this flood are licensed CC-BY-NC-4.0: attribution required, non-commercial use only. The STAC catalog lives at source.coop under planet/disasterdata/nepal-flash-flood-2026-08-26. This site does not copy Planet pixels into a public-domain dump. Thumbnails and OpenAerialMap tiles are shown for non-commercial comparison with credit. Do not treat those frames as free stock. Visual assets can be compared by eye; pre-event PlanetScope is surface reflectance and post-event PlanetScope is TOA radiance, so uncorrected spectral differencing is not valid.
三维图怎么转？
拖首页右侧转盘的外圈改水平朝向，拖中心改俯仰。双击中心会回到当前地点的预设镜头。键盘：Q / E 转向，R / F 俯仰，J / K 沿河谷换地点，逗号和句号换胶片条，方括号移动对照滑杆。手机上也可以点「上一处 / 下一处」。这张三维图是 MapLibre 地形夸张，不是 Cesium 原作。要看渡边实验室的相机和幻灯，请打开 Cesium 故事页。
How do I rotate the 3D map?
Drag the outer tire of the orbit wheel on the homepage to change bearing; drag the hub up or down to change pitch. Double-click the hub to reset the current site’s camera. Keyboard: Q and E yaw, R and F pitch. J and K step sites along the corridor; comma and period change filmstrip pairs; brackets move the compare slider. The 3D view is MapLibre terrain, not the Cesium original. Open the Watanabe Lab story for the Cesium camera.
伤亡数字为什么还在跳？
伤亡与失踪数字仍在跳变，本站不公布最终死亡总数。尼泊尔警察在 报已寻获 469 具遗体。NDRRMA 第 6 份状态报告（）写已寻获 389、失踪 977。BBC 日文 引尼泊尔至少 469 死、失踪 910，西藏 3 死、失踪 558。两侧失踪名单可能在吉隆口岸–热索桥重叠（朝圣者、司机、边检）。没有双边对账名单，不要把两边相加当成一个全球数字。
Why are casualty numbers still moving?
Published death and missing counts are dated snapshots, not a final total. Nepal Police at 07:00 NPT on reported 469 recovered bodies. NDRRMA’s sixth situation report on listed 389 recovered and 977 missing. BBC Japanese on 28 August cited at least 469 dead in Nepal and 910 missing, plus 3 confirmed dead and 558 missing in Tibet. Those missing lists can overlap at Gyirong/Rasuwagadhi. This site does not add the two sides into one global number.