{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:PIU5KMKN64MWQ5HXKIRM2OKNF5","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b9441f80a0fd41981a9e9c32796369b53bb9a51e16e78b0480d74c8386454ece","cross_cats_sorted":["cs.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2016-07-04T17:33:05Z","title_canon_sha256":"c9e428290aa409b0b34ca2c2b454eebeb26c434d7e4fcdc1472e7952ddafceb1"},"schema_version":"1.0","source":{"id":"1607.00968","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.00968","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"arxiv_version","alias_value":"1607.00968v4","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.00968","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"pith_short_12","alias_value":"PIU5KMKN64MW","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_16","alias_value":"PIU5KMKN64MWQ5HX","created_at":"2026-05-18T12:30:39Z"},{"alias_kind":"pith_short_8","alias_value":"PIU5KMKN","created_at":"2026-05-18T12:30:39Z"}],"graph_snapshots":[{"event_id":"sha256:81813a983d9c0168415fb7887505bef96d9db8e52c4d5064f2b27b1f74ed707d","target":"graph","created_at":"2026-05-18T00:43:09Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Full waveform inversion (FWI) is a process in which seismic numerical simulations are fit to observed data by changing the wave velocity model of the medium under investigation. The problem is non-linear, and therefore optimization techniques have been used to find a reasonable solution to the problem. The main problem in fitting the data is the lack of low spatial frequencies. This deficiency often leads to a local minimum and to non-plausible solutions. In this work we explore how to obtain low frequency information for FWI. Our approach involves augmenting FWI with travel time tomography, w","authors_text":"Eldad Haber, Eran Treister","cross_cats":["cs.NA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2016-07-04T17:33:05Z","title":"Full waveform inversion guided by travel time tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.00968","kind":"arxiv","version":4},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c2753d5c75af6d37158231083254327088fd97602dfb882f278cba3b7ebd42ba","target":"record","created_at":"2026-05-18T00:43:09Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b9441f80a0fd41981a9e9c32796369b53bb9a51e16e78b0480d74c8386454ece","cross_cats_sorted":["cs.NA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2016-07-04T17:33:05Z","title_canon_sha256":"c9e428290aa409b0b34ca2c2b454eebeb26c434d7e4fcdc1472e7952ddafceb1"},"schema_version":"1.0","source":{"id":"1607.00968","kind":"arxiv","version":4}},"canonical_sha256":"7a29d5314df7196874f75222cd394d2f5030fe5bf7762be45ffbc8cb2dd85277","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7a29d5314df7196874f75222cd394d2f5030fe5bf7762be45ffbc8cb2dd85277","first_computed_at":"2026-05-18T00:43:09.322182Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:43:09.322182Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MQiveKje81/MGwrDTHjKa57XLWOdFS4G7ijVsynrPqaquiYU0B103NY5MIsuu5JBi+UH3TzWd5toSvgvvpg4CQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:43:09.322740Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.00968","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c2753d5c75af6d37158231083254327088fd97602dfb882f278cba3b7ebd42ba","sha256:81813a983d9c0168415fb7887505bef96d9db8e52c4d5064f2b27b1f74ed707d"],"state_sha256":"d7ef25717a74b62e39e63e78d8b2220c64807925e86ee619bf3b2082e834dfca"}