{"artifact_id":"L1-277","layer":"L1","title":"Ambient-Noise Tomography — Green-function retrieval","domain":"Geophysics","sub_domain":"Cross-correlation of ambient seismic noise","physics_fingerprint":{"L_DAG":3.3,"title":"Ambient-Noise Tomography — Green-function retrieval","domain":"Geophysics","carrier":"acoustic","primitives":["L.cross_correlate","L.green_retrieve","L.tomographic_invert","int.temporal"],"sub_domain":"Cross-correlation of ambient seismic noise","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"2D_phase_velocity_map","difficulty_delta":5,"integration_axis":"temporal","sensing_mechanism":"continuous_seismometer"},"observable_profile":{"metric":"c_rel_error_percent","regime":"Conditional stability; mismatch parameters dominate at Omega bounds.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"N_days":365,"SNR_dB":25,"N_freqs":10,"N_stations":50,"scattering_unmodelled":0.0,"station_pair_imbalance":0.0,"source_distribution_nonuniform":0.1},"input_format":"measurement_only","problem_class":"ant","forward_operator":"ant_forward","epsilon_fn_center":"5.0"},"omega_bounds":{"N_days":[7,3650],"SNR_dB":[0,40],"N_freqs":[1,50],"N_stations":[5,5000],"scattering_unmodelled":[0.0,0.3],"station_pair_imbalance":[0.0,0.3],"source_distribution_nonuniform":[0.0,0.5]},"epsilon_bounds":{"c_rel":[0.5,30.0]},"allowed_problem_classes":["ant"],"allowed_omega_dimensions":["N_stations","N_days","N_freqs","SNR_dB","source_distribution_nonuniform","station_pair_imbalance","scattering_unmodelled","source_distribution_nonuniform","station_pair_imbalance","scattering_unmodelled"],"allowed_forward_operators":["ant_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":500,"metric":"c_rel_error_percent"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xc80cca227b15a29210429b8b75e41e2590f9197ec7f4b025e3a6faf56b373a4e","chain_tx_hash":"0x6cc7c9773073bbe621b89e52d95244aed1f1cfc377e8f9b81db2d99ad3e10db2","chain_block":41554051}