Project 2 Approach USGS Earthquakes

Author

Andre Thomson

Published

October 11, 2026

Dataset selection and plan

I downloaded the USGS earthquake records for January 2025, keeping earthquakes with a magnitude of at least 4.5. I used the depth and depth-error columns for this part. I changed those two columns into long format and checked how many values were missing. They both use kilometers, but depth and depth error mean different things.

Original source and planned output

Official CSV query: USGS January 2025 magnitude 4.5+ earthquakes. The original download is saved without changes in data/raw/.

In the Code Base, I use pivot_longer(), make a summary table, and create a chart. I leave the downloaded CSV unchanged.

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## Dataset selection and plan

I downloaded the USGS earthquake records for January 2025, keeping earthquakes with a magnitude of at least 4.5. I used the depth and depth-error columns for this part. I changed those two columns into long format and checked how many values were missing. They both use kilometers, but depth and depth error mean different things.

## Original source and planned output

Official CSV query: [USGS January 2025 magnitude 4.5+ earthquakes](https://earthquake.usgs.gov/fdsnws/event/1/query?format=csv&starttime=2025-01-01&endtime=2025-02-01&minmagnitude=4.5&orderby=time). The original download is saved without changes in `data/raw/`.

In the Code Base, I use `pivot_longer()`, make a summary table, and create a chart. I leave the downloaded CSV unchanged.