Zoom historical seismic activity plot to a 1 minute graph

[johnwalicki]

The third dashboard in this repo plots the historical seismic activity from an OpenEEW dataset. It plots a 5 minute window. That's the size of the downloaded jsonl file. Sometimes we want to zoom in on one minute to see the earthquake activity.

@johnwalicki hacked up a Node-RED Function javascript node that compares the downloaded dataset to a Unix Epoch timestamp range (with hand edited comparisons). That let me plot a 1 minute graph.

Would be great to generalize this in the historical seismic activity dashboard. Let the user enter the specific minute. Convert that to epoch miniseconds, find that range in the dataset, plot the 1 minute graph.

This task would need someone familiar with Node-RED, Node-RED Dashboards, a little bit of UX design, a small amount of javascript programming.