A 7.0 quake at 4,800 metres: Tibet counts 16 dead and 339 fallen homes, and races the cold

It struck at 10:33 on Thursday night, in the dark, in one of the highest inhabited landscapes on earth. A magnitude 7.0 earthquake hit Baqen County near Nagqu in northern Tibet, at a depth of 18 kilometres on the US Geological Survey reading, with the epicentre about 191 kilometres east northeast of the city. By Friday, officials counted at least 16 people dead, dozens injured, 11 of them seriously, and 339 homes collapsed along with 20 livestock sheds. Those numbers come from a place where getting a count at all is the first rescue problem.

The plateau is the reason a quake of this size, in a sparsely populated area, still kills. The country around Nagqu averages about 4,800 metres above sea level, which means thin air for rescuers, sub zero nights for survivors sleeping outside, and long distances between settlements joined by roads a quake can close. Rockfalls blocked sections of National Highway 317, restricting it to emergency vehicles, rail services were suspended while the Qinghai Tibet line was checked, and snowfall in the forecast threatens to slow what the altitude has not. More than 1,600 local rescue personnel were deployed, with about 1,000 prefabricated housing units, 3,000 tents and folding beds, torches and winter clothing sent in, and later reports put the number of people relocated from the worst hit zones above 12,000.

Underneath the logistics sits the geology that built the plateau itself. Tibet is where the Indian plate is still pushing into Eurasia, the collision that raised the Himalayas and keeps raising them, and the whole region stores that pressure in faults that let go without asking permission. Chinese state broadcaster CCTV called this the region's strongest earthquake in five years. The USGS recorded a run of aftershocks after the main shock, the largest around magnitude 5.2, and hundreds of smaller tremors were registered through Friday, each one a reason for families to stay out of cracked houses even as the cold argues the other way.

The honest uncertainty in this story is the toll. Early official breakdowns put the injured at 32 before later state media updates raised the figure to 54 and beyond, and in remote townships reached by damaged roads the first count is a floor, not a ceiling. What is not uncertain is the pattern: adobe and unreinforced brick and mud construction, the common building stock the USGS flags as most vulnerable in this region, is what collapses at magnitude 7, and it collapses at night, on sleeping families, in the cold.

Our call is that the next 72 hours decide whether this stays a disaster or becomes a catastrophe, and the deciding variable is shelter, not search. The dead who can be found in rubble at this altitude are mostly found in the first day. After that, exposure does the killing: thousands of people in tents and prefabricated units at 4,800 metres, with aftershocks still rolling and snow moving in, need heat and roofs more than they need more rescuers. Watch the supply columns on Highway 317. In Tibet, the rescue is the road.