{
  "annotation_id": "a978006b-d83c-48ac-8ab0-4e26faec788c",
  "date_created": "2026-03-02T18:00:50.132000Z",
  "date_modified": "2026-03-02T18:00:50.132000Z",
  "file_hash": "6f4f04a35bde66d1e24ff15c57d1409b4f27807be4f1675b4b9e0984b869c022",
  "private": false,
  "record": {
    "abstract": "The nearly-incessant free oscillations of the Earth (not the larger,\nlong-lived normal modes seen following intense quakes) were first observed by\naccident in the record of a tilt-sensitive instrument designed to study surface\nphysics. Later tiltmeter studies demonstrated the usefulness of autocorrelation\nfor the routine study of these normally short-lived eigenmodes. More recent\nstudies suggest that many tilt-sensitive instruments are capable of observing\nthese oscillations--if the low-frequency response of their electronics is not\nsuppressed, as is customary with conventional designs.",
    "arxiv_id": "physics/0401122",
    "authors": [
      "Randall D. Peters"
    ],
    "categories": [
      "physics.geo-ph",
      "physics.ins-det"
    ],
    "title": "Folded Pendulum Measurements of Earth\u0027s Free Oscillations",
    "url": "https://arxiv.org/abs/physics/0401122"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fbd2edb2-6ae7-42bc-827d-3c7bf6d7305e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}