{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:RS2TNZZPB4HSRBZWRNYEJWQYAU","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":"034eaed20c7c29c0fef19e23972a27b83a9d413d290b9c4ffe6c11ca387e7c49","cross_cats_sorted":["physics.geo-ph","stat.ME"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-11-04T23:21:27Z","title_canon_sha256":"33eceb41cc828291da7fdeb2a3da093ce76dbdd947e98c3f8c1a6ce226b3f0af"},"schema_version":"1.0","source":{"id":"1511.02178","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.02178","created_at":"2026-05-18T01:27:37Z"},{"alias_kind":"arxiv_version","alias_value":"1511.02178v1","created_at":"2026-05-18T01:27:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.02178","created_at":"2026-05-18T01:27:37Z"},{"alias_kind":"pith_short_12","alias_value":"RS2TNZZPB4HS","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_16","alias_value":"RS2TNZZPB4HSRBZW","created_at":"2026-05-18T12:29:39Z"},{"alias_kind":"pith_short_8","alias_value":"RS2TNZZP","created_at":"2026-05-18T12:29:39Z"}],"graph_snapshots":[{"event_id":"sha256:dda2985ca8d7fc2cab4f363ad63f3ce484e5b4b1acd9cf4a77f362d67e74975b","target":"graph","created_at":"2026-05-18T01:27:37Z","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":"Ensemble Kalman filtering (EnKF) is an efficient approach to addressing uncertainties in subsurface groundwater models. The EnKF sequentially integrates field data into simulation models to obtain a better characterization of the model's state and parameters. These are generally estimated following joint and dual filtering strategies, in which, at each assimilation cycle, a forecast step by the model is followed by an update step with incoming observations. The Joint-EnKF directly updates the augmented state-parameter vector while the Dual-EnKF employs two separate filters, first estimating th","authors_text":"Boujemaa Ait-El-Fquih, Ibrahim Hoteit, Mohamad El Gharamti","cross_cats":["physics.geo-ph","stat.ME"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-11-04T23:21:27Z","title":"A Bayesian Consistent Dual Ensemble Kalman Filter for State-Parameter Estimation in Subsurface Hydrology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.02178","kind":"arxiv","version":1},"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:d572fed1e0b0aca1949339ac8f6b66ab610ea9b2aa7c46c0ac6fdc8aea24845b","target":"record","created_at":"2026-05-18T01:27:37Z","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":"034eaed20c7c29c0fef19e23972a27b83a9d413d290b9c4ffe6c11ca387e7c49","cross_cats_sorted":["physics.geo-ph","stat.ME"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2015-11-04T23:21:27Z","title_canon_sha256":"33eceb41cc828291da7fdeb2a3da093ce76dbdd947e98c3f8c1a6ce226b3f0af"},"schema_version":"1.0","source":{"id":"1511.02178","kind":"arxiv","version":1}},"canonical_sha256":"8cb536e72f0f0f2887368b7044da18053d1b5a11ea9a05cfb1a801c564ae16f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8cb536e72f0f0f2887368b7044da18053d1b5a11ea9a05cfb1a801c564ae16f7","first_computed_at":"2026-05-18T01:27:37.560460Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:27:37.560460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Cf5Hz6G/D71CbDqLffqhWA63cc45DFY/N/znd8yzGIFlU47yo51VPI9dSap5znD6ciKUwHRJUi8yR/WjsBIoAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:27:37.561183Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.02178","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d572fed1e0b0aca1949339ac8f6b66ab610ea9b2aa7c46c0ac6fdc8aea24845b","sha256:dda2985ca8d7fc2cab4f363ad63f3ce484e5b4b1acd9cf4a77f362d67e74975b"],"state_sha256":"9013a6064bf6f97591d1fcfaf6ac1eaf96498d6d5b5e5a7a864eaf209025c371"}