Fortnite Chapter 3 Season 1: Where to collect readings from seismometers

As soon as The Scientist approaches you and asks you to collect readings from the seismometers, you mark their locations on your map. There are nine of them, and they're strewn over the mountainous territory around the Logjam Lumberyard in the map's northwest corner.  

Given that you must visit Logjam Lumberyard to begin the quest, we recommend gathering readings from the three seismometers closest to Logjam Lumberyard (marked 1, 4, and 6 on the map below), but here are the locations of all nine seismometers in case you want to venture further.

1. Logjam Lumberyard is located on the northeast slopes of a big mountain northwest of Logjam Lumberyard.
2. North of the mansion, on the northern slope of a mountain with a maze
3. On the western slopes of a big mountain northwest of Logjam Lumberyard, on a ledge
4. Northeast of Logjam Lumberyard, on a low ridge
5. West of Logjam Lumberyard, on a coastal ridge
6. Logjam Lumberyard is located west of the lake and south of Logjam Lumberyard.
7. West of the Llama Homestead, on the riverbank
8. On the north side of the mountain, north of Camp Cuddle, behind a Reboot Van
9. Across the lake from Camp Cuddle on the south side of the forest
   

Simply interact with the seismometers to get data. To accomplish the quest, you must get three matches in a row.