JSFiddle - React, Tailwind, and code Playground

HTML

<select id="usgsfeed" name="usgsfeed" size="1" onchange="display_usgs_change();">
    <option value="usgs_hour">Past hour, all earthquakes</option>
    <option value="usgs_day" selected="selected">Past day, magnitude > 1</option>
    <option value="usgs_week">Past week, magnitude > 2.5</option>
    <option value="usgs_month">Past month, magnitude > 2.5</option>
    <option value="none">None</option>
</select>
<div id="dummy">Remove this div!</div>

JavaScript

function display_usgs_change() {
    document.getElementById('dummy').innerHTML = event.target.value;
}