Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 15-04-2023 and time 04:31:35 (Italy) in region 1 km W Montagano (CB)

A magnitude ML 1.8 earthquake occured in region: 1 km W Montagano (CB), on

  • 15-04-2023 02:31:35 (UTC)
  • 15-04-2023 04:31:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.6500, 14.6600 at 23 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Montagano CB 1 1086 1086
Ripalimosani CB 4 3114 4200
Limosano CB 4 768 4968
Petrella Tifernina CB 6 1170 6138
Matrice CB 6 1115 7253
Sant'Angelo Limosano CB 7 352 7605
Castellino del Biferno CB 8 545 8150
Castropignano CB 9 947 9097
Campolieto CB 9 839 9936
San Biase CB 9 189 10125
Oratino CB 9 1641 11766
Lucito CB 10 696 12462
Fossalto CB 10 1345 13807
San Giovanni in Galdo CB 10 580 14387
Campobasso CB 10 49431 63818
Torella del Sannio CB 11 795 64613
Pietracupa CB 12 215 64828
Morrone del Sannio CB 12 587 65415
Castelbottaccio CB 12 312 65727
Toro CB 12 1391 67118
Campodipietra CB 13 2570 69688
Ripabottoni CB 13 514 70202
Busso CB 13 1273 71475
Ferrazzano CB 13 3344 74819
Casalciprano CB 13 564 75383
Monacilioni CB 13 523 75906
Molise CB 14 167 76073
Lupara CB 14 505 76578
Civitacampomarano CB 15 417 76995
Mirabello Sannitico CB 15 2180 79175
Provvidenti CB 16 119 79294
Baranello CB 16 2673 81967
Salcito CB 16 683 82650
Duronia CB 17 405 83055
Gildone CB 17 809 83864
Sant'Elena Sannita IS 18 275 84139
Trivento CB 18 4730 88869
Bagnoli del Trigno IS 18 735 89604
Frosolone IS 18 3170 92774
Sant'Elia a Pianisi CB 18 1818 94592
Vinchiaturo CB 18 3324 97916
Jelsi CB 19 1781 99697
Spinete CB 19 1320 101017
Casacalenda CB 19 2135 103152
Pietracatella CB 19 1375 104527
Colle d'Anchise CB 20 807 105334

Municipalities with at least 50000 inhabitants

An earthquake occurred to
59 Km N of Benevento (60091 inhabitants)
60 Km W of San Severo (53905 inhabitants)
70 Km NE of Caserta (76326 inhabitants)
77 Km W of Foggia (151991 inhabitants)
82 Km N of Acerra (59573 inhabitants)
83 Km N of Avellino (54857 inhabitants)
84 Km NE of Aversa (53047 inhabitants)
86 Km NE of Afragola (65057 inhabitants)
88 Km SE of Chieti (51815 inhabitants)
88 Km NE of Casoria (77642 inhabitants)
89 Km NE of Giugliano in Campania (122974 inhabitants)
92 Km NE of Marano di Napoli (59874 inhabitants)
95 Km N of Portici (55274 inhabitants)
96 Km NE of Napoli (974074 inhabitants)
97 Km N of Ercolano (53709 inhabitants)
98 Km SE of Pescara (121014 inhabitants)
99 Km N of Torre del Greco (86275 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.8 2023-04-15
02:31:35		 41.6503 14.6597 23 2024-03-01
17:18:03		 Bollettino Sismico Italiano INGV 116426881
Reviewed
Rev100 		ML 1.8 2023-04-15
02:31:35		 41.6512 14.6398 20 2023-04-15
02:50:20		 Sala Sismica INGV-Roma 116399421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-15 02:31:35 ± 0.12
Latitude 41.6503 ± 0.0045
Longitude 14.6597 ± 0.0060
Depth (km) 23 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116426881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 507
Semi-minor axis of confidence ellipse (meter) 197
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 307
Circular confidence region, given by single value of horizontal uncertainty (meter) 510.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.11511
Epicentral distance of station farthest from the epicenter (degree) 0.93260
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 116426881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-23 12:36:52

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 27
Type of magnitude ML
Reference to an origin 116399421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-15 02:50:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.INTR.HHZ. 2023-04-15T02:31:57.80 0.6 undecidable manual S 303 74.1702 101 -0.06 46
OT.OT12.EHZ. 2023-04-15T02:31:54.17 0.3 undecidable manual P 91 103.5186 97 1.38 39
IV.PSB1.HNE. 2023-04-15T02:31:52.24 0.6 undecidable manual S 165 49.0176 107 0.91 37
IV.SGRT.HHZ. 2023-04-15T02:31:50.61 0.3 undecidable manual P 82 90.5427 99 -0.2 64
OT.OT16.EHZ. 2023-04-15T02:31:50.60 0.6 undecidable manual S 64 46.9197 108 -0.21 46
IV.MELA.HHZ. 2023-04-15T02:31:49.00 0.6 undecidable manual S 81 39.2274 113 0.13 48
IV.SGG.HHZ. 2023-04-15T02:31:48.90 0.6 undecidable manual S 219 37.4292 114 0.47 45
IT.GLNS.HNE. 2023-04-15T02:31:48.70 0.6 undecidable manual S 36 36.0417 115 0.6 43
IV.INTR.HHZ. 2023-04-15T02:31:48.01 0.3 undecidable manual P 303 74.1702 101 -0.32 65
IV.PTRJ.HHZ. 2023-04-15T02:31:47.48 0.3 undecidable manual S 199 33.5442 117 -0.02 74
IV.SACR.HHZ. 2023-04-15T02:31:46.00 0.6 undecidable manual S 172 28.3494 122 -0.28 47
IT.MCLF.HNZ. 2023-04-15T02:31:46.85 0.6 undecidable manual S 28 31.5462 119 -0.17 48
IT.PLTA.HNZ. 2023-04-15T02:31:46.10 0.6 undecidable manual S 22 28.2495 122 -0.17 48
IV.PABO.HHZ. 2023-04-15T02:31:46.20 0.6 undecidable manual S 296 25.0527 126 0.64 43
OT.OT11.EHE. 2023-04-15T02:31:45.40 0.3 undecidable manual P 105 58.0974 104 -0.5 64
IV.LPEL.HHZ. 2023-04-15T02:31:45.91 0.3 undecidable manual P 318 58.9965 104 -0.14 70
IV.CIGN.HHZ. 2023-04-15T02:31:45.45 0.6 undecidable manual S 89 20.3685 132 0.87 40
IV.CERA.HNN. 2023-04-15T02:31:45.29 0.3 undecidable manual P 264 53.502 106 0.06 71
IV.GATE.HHZ. 2023-04-15T02:31:45.50 0.6 undecidable manual S 126 25.752 125 -0.21 48
IV.PSB1.HNE. 2023-04-15T02:31:44.57 0.3 undecidable manual P 165 49.0176 107 0.01 72
IV.BSSO.HHZ. 2023-04-15T02:31:43.00 0.3 undecidable manual S 205 12.7761 147 -0.27 72
IV.VAGA.HHZ. 2023-04-15T02:31:43.78 0.1 undecidable manual P 234 43.9227 110 -0.04 97
IV.MELA.HHZ. 2023-04-15T02:31:43.04 0.1 positive manual P 81 39.2274 113 -0.1 96
OT.OT16.EHZ. 2023-04-15T02:31:43.92 0.1 undecidable manual P 64 46.9197 108 -0.34 90
IV.SGG.HHZ. 2023-04-15T02:31:42.75 0.1 undecidable manual P 219 37.4292 114 -0.14 96
IT.GLNS.HNE. 2023-04-15T02:31:42.69 0.3 undecidable manual P 36 36.0417 115 0 74
IV.PTRJ.HHZ. 2023-04-15T02:31:42.28 0.1 undecidable manual P 199 33.5442 117 -0.07 98
IT.LRNO.HNZ. 2023-04-15T02:31:41.43 0.3 undecidable manual P 51 27.6501 123 -0.13 73
IT.MCLF.HNZ. 2023-04-15T02:31:41.90 0.3 undecidable manual P 28 31.5462 119 -0.17 72
IV.SACR.HHZ. 2023-04-15T02:31:41.31 0.1 negative manual P 172 28.3494 122 -0.34 94
IV.GATE.HHZ. 2023-04-15T02:31:41.61 0.3 undecidable manual P 126 25.752 125 0.29 71
IT.PLTA.HNZ. 2023-04-15T02:31:41.76 0.3 undecidable manual P 22 28.2495 122 0.12 74
IV.PABO.HHZ. 2023-04-15T02:31:41.61 0.3 undecidable manual P 296 25.0527 126 0.38 70
IV.CIGN.HHZ. 2023-04-15T02:31:40.81 0.1 positive manual P 89 20.3685 132 0.15 99
IV.BSSO.HHZ. 2023-04-15T02:31:39.77 0.1 undecidable manual P 205 12.7761 147 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BSSO.HHE. ML:2.3 0.00138 0.36 AML other m 2023-04-15T02:31:43.60
IV.BSSO.HNE. ML:2.3 0.0013305 0.38 AML other m 2023-04-15T02:31:43.60
IV.BSSO.HHN. ML:2.3 0.0013 0.4 AML other m 2023-04-15T02:31:44.08
IV.BSSO.HNN. ML:2.3 0.0012749999999999999 0.42 AML other m 2023-04-15T02:31:44.08
IV.SACR.HHE. ML:1.6 0.000179 0.84 AML other m 2023-04-15T02:31:46.65
IV.SACR.HHN. ML:1.5 0.00012945 1.44 AML other m 2023-04-15T02:31:47.06
IV.CIGN.HHE. ML:1.9 0.000372 0.4 AML other m 2023-04-15T02:31:48.34
IV.GATE.HHE. ML:1.7 0.000214 0.54 AML other m 2023-04-15T02:31:48.36
IV.GATE.HNE. ML:1.7 0.000219 0.56 AML other m 2023-04-15T02:31:48.36
IV.GATE.HHN. ML:1.6 0.000153 0.38 AML other m 2023-04-15T02:31:48.60
IV.GATE.HNN. ML:1.6 0.0001648 0.62 AML other m 2023-04-15T02:31:48.60
IV.PTRJ.HHE. ML:2.0 0.00035299999999999996 0.76 AML other m 2023-04-15T02:31:48.32
IV.MELA.HNN. ML:2.0 0.0002930173 0.1488 AML other m 2023-04-15T02:31:50.06
IV.MELA.HHE. ML:1.7 0.000154087945 0.0992 AML other m 2023-04-15T02:31:50.39
IV.PTRJ.HHN. ML:1.8 0.0002175 0.28 AML other m 2023-04-15T02:31:50.30
IV.CIGN.HHN. ML:1.9 0.000419 0.38 AML other m 2023-04-15T02:31:50.90
IV.SGG.HHN. ML:1.7 0.00017199999999999998 0.32 AML other m 2023-04-15T02:31:51.88
IV.SGG.HHE. ML:1.7 0.00016499999999999997 1.2 AML other m 2023-04-15T02:31:52.00
IV.VAGA.HHN. ML:1.7 0.00014000000000000001 1.12 AML other m 2023-04-15T02:31:53.73
IV.VAGA.HHE. ML:1.5 0.00009475 1.08 AML other m 2023-04-15T02:31:55.80
IV.LPEL.HHE. ML:1.8 0.0001305 0.16 AML other m 2023-04-15T02:31:56.45
IV.LPEL.HHN. ML:2.0 0.0001735 0.14 AML other m 2023-04-15T02:31:56.55
IV.INTR.HHE. ML:1.7 0.00007975 0.72 AML other m 2023-04-15T02:32:01.34
IV.INTR.HHN. ML:1.8 0.00009655 1.36 AML other m 2023-04-15T02:32:01.69
IV.SGRT.HHE. ML:1.9 0.00008597891499999999 0.2192 AML other m 2023-04-15T02:32:06.15
IV.SGRT.HHN. ML:1.7 0.00006240893 0.2992 AML other m 2023-04-15T02:32:07.36
OT.OT12.EHN. ML:2.0 0.00010045000000000002 0.32 AML other m 2023-04-15T02:32:08.17
OT.OT12.EHE. ML:1.9 0.00008010000000000001 0.28 AML other m 2023-04-15T02:32:08.20
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download