earthquake_get_feed

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Fetch a USGS pre-computed real-time earthquake feed by magnitude tier and time window. These feeds are CDN-cached by USGS and faster and more available than the query API — use them for "what's happening now" queries. "all" includes microseisms (M<1); "significant" is a USGS curation based on magnitude, felt reports, and PAGER impact estimates. "hour" returns 0–10 events typically; "month" can exceed 10,000 for the "all" tier, so results are returned a page at a time: count is the page size, totalCount the whole feed, and nextCursor the input for the following page. The cursor is opaque and must be passed back verbatim — unlike earthquake_search, these feeds have no upstream paging parameter and USGS regenerates them about once a minute, so a numeric offset across two calls would skip or repeat events. For historical or filtered queries, use earthquake_search instead.