Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 22-08-2023 and time 20:16:32 (Italy) in region 1 km SE Bruno (AT)

A magnitude ML 2.1 earthquake occured in region: 1 km SE Bruno (AT), on

  • 22-08-2023 18:16:32 (UTC)
  • 22-08-2023 20:16:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.7850, 8.4460 at 28 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
Bruno AT 1 321 321
Mombaruzzo AT 2 1117 1438
Castelnuovo Belbo AT 3 895 2333
Quaranti AT 4 183 2516
Maranzana AT 4 277 2793
Fontanile AT 4 567 3360
Castelletto Molina AT 4 180 3540
Bergamasco AL 5 744 4284
Carentino AL 5 340 4624
Incisa Scapaccino AT 6 2288 6912
Ricaldone AL 6 684 7596
Alice Bel Colle AL 7 766 8362
Nizza Monferrato AT 7 10429 18791
Cassine AL 8 2961 21752
Castel Rocchero AT 8 395 22147
Cortiglione AT 8 571 22718
Gamalero AL 8 844 23562
Frascaro AL 8 440 24002
Vaglio Serra AT 9 275 24277
Castel Boglione AT 9 609 24886
Oviglio AL 9 1265 26151
Castelnuovo Bormida AL 9 694 26845
Borgoratto Alessandrino AL 10 584 27429
Masio AL 10 1420 28849
Sezzadio AL 10 1246 30095
Calamandrana AT 10 1761 31856
Belveglio AT 10 350 32206
Vinchio AT 10 601 32807
Montabone AT 10 333 33140
Castelspina AL 11 416 33556
Strevi AL 11 2019 35575
Rocchetta Tanaro AT 12 1450 37025
Rivalta Bormida AL 12 1446 38471
Rocchetta Palafea AT 12 338 38809
Cerro Tanaro AT 12 626 39435
Acqui Terme AL 12 19896 59331
San Marzano Oliveto AT 12 1047 60378
Mombercelli AT 12 2259 62637
Castellazzo Bormida AL 13 4570 67207
Castelnuovo Calcea AT 13 759 67966
Felizzano AL 13 2344 70310
Terzo AL 13 923 71233
Quattordio AL 13 1637 72870
Moasca AT 13 494 73364
Orsara Bormida AL 14 424 73788
Canelli AT 14 10485 84273
Visone AL 14 1194 85467
Castello di Annone AT 15 1860 87327
Bistagno AL 15 1887 89214
Casal Cermelli AL 15 1234 90448
Agliano Terme AT 15 1642 92090
Sessame AT 15 271 92361
Cassinasco AT 16 611 92972
Montaldo Scarampi AT 16 755 93727
Melazzo AL 16 1325 95052
Morsasco AL 16 679 95731
Solero AL 16 1645 97376
Rocca d'Arazzo AT 16 936 98312
Montaldo Bormida AL 16 664 98976
Montegrosso d'Asti AT 17 2344 101320
Cavatore AL 17 291 101611
Azzano d'Asti AT 17 391 102002
Predosa AL 17 2048 104050
Carpeneto AL 17 977 105027
Trisobbio AL 18 655 105682
Grognardo AL 18 259 105941
Vigliano d'Asti AT 18 835 106776
Calosso AT 18 1279 108055
Prasco AL 18 521 108576
Monastero Bormida AT 18 931 109507
Bubbio AT 18 893 110400
Castelletto d'Erro AL 18 148 110548
Quargnento AL 18 1398 111946
Ponti AL 19 606 112552
Bosco Marengo AL 19 2457 115009
Santo Stefano Belbo CN 19 3984 118993
Refrancore AT 19 1591 120584
Fresonara AL 19 731 121315
Mongardino AT 19 921 122236
Loazzolo AT 20 359 122595
Frugarolo AL 20 1968 124563
Alessandria AL 20 93943 218506
Cremolino AL 20 1086 219592

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km SW of Alessandria (93943 inhabitants)
23 Km SE of Asti (76202 inhabitants)
53 Km N of Savona (61345 inhabitants)
57 Km NW of Genova (586655 inhabitants)
65 Km E of Moncalieri (57294 inhabitants)
68 Km SW of Vigevano (63310 inhabitants)
68 Km E of Torino (890529 inhabitants)
72 Km SW of Pavia (72576 inhabitants)
75 Km S of Novara (104380 inhabitants)
83 Km NE of Cuneo (56081 inhabitants)
95 Km SW of Rho (50434 inhabitants)
96 Km SW of Milano (1345851 inhabitants)
97 Km SW of Legnano (60262 inhabitants)
98 Km SW of Busto Arsizio (83106 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 2.1 2023-08-22
18:16:32		 44.7852 8.4458 28 2024-09-10
16:44:19		 Bollettino Sismico Italiano INGV 121617681
Reviewed
Rev100 		ML 2.2 2023-08-22
18:16:32		 44.7972 8.4673 23 2023-08-22
18:29:37		 Sala Sismica INGV-Roma 120389861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-22 18:16:32 ± 0.1
Latitude 44.7852 ± 0.0072
Longitude 8.4458 ± 0.0127
Depth (km) 28 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 121617681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 998
Semi-minor axis of confidence ellipse (meter) 465
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 72
Circular confidence region, given by single value of horizontal uncertainty (meter) 1000.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 34
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.47
Epicentral distance of station closest to the epicenter (degree) 0.09263
Epicentral distance of station farthest from the epicenter (degree) 1.67544
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 34
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 58
Type of magnitude ML
Reference to an origin 120389861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-22 18:29:37

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 68
Type of magnitude ML
Reference to an origin 121617681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-09-06 16:06:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.SATI.HHZ. 2023-08-22T18:17:08.80 0.6 undecidable manual S 340 129.0708 54 -0.26 40
CH.FUSIO.HHZ. 2023-08-22T18:17:00.74 0.3 undecidable manual P 5 185.9694 54 0.08 51
GU.TRAV.HHZ. 2023-08-22T18:17:00.56 0.3 undecidable manual S 326 97.4247 101 -0.78 55
CH.DIX.HHZ. 2023-08-22T18:16:57.89 0.6 undecidable manual P 331 164.8128 54 -0.13 37
GU.REMY.HNN. 2023-08-22T18:16:56.78 0.1 undecidable manual P 320 154.1346 54 0.09 80
IV.MRGE.HHZ. 2023-08-22T18:16:56.69 0.3 undecidable manual P 316 153.6351 54 0.05 60
4P.IT01A.HHZ. 2023-08-22T18:16:56.30 0.6 undecidable manual S 21 70.5738 106 1.93 21
CH.MMK.HHZ. 2023-08-22T18:16:56.03 0.1 undecidable manual P 345 145.2435 54 0.44 77
IV.MDI.HHZ. 2023-08-22T18:16:55.71 0.3 undecidable manual P 42 147.5412 54 -0.16 59
IV.PLMA.HHZ. 2023-08-22T18:16:54.81 0.3 undecidable manual P 126 138.1617 54 0.1 62
GU.GORR.HHZ. 2023-08-22T18:16:54.77 0.6 undecidable manual S 106 69.5748 106 0.66 42
CH.MUGIO.HHZ. 2023-08-22T18:16:53.72 0.3 undecidable manual P 20 134.3655 54 -0.52 56
GU.SATI.HHZ. 2023-08-22T18:16:53.30 0.3 undecidable manual P 340 129.0708 54 -0.28 60
GU.RRL.HHZ. 2023-08-22T18:16:53.76 0.1 undecidable manual P 277 131.0688 54 -0.07 85
GU.LSD.HHZ. 2023-08-22T18:16:52.59 0.3 undecidable manual P 307 127.0728 54 -0.73 53
GU.IMI.HHZ. 2023-08-22T18:16:51.02 0.3 undecidable manual P 205 106.5156 100 0.54 59
FR.SAOF.HHZ.00 2023-08-22T18:16:51.99 0.3 undecidable manual P 219 113.3976 100 0.45 60
GU.STV.HHZ. 2023-08-22T18:16:51.05 0.6 undecidable manual P 236 106.9152 100 0.5 40
4P.IT06A.HHZ. 2023-08-22T18:16:50.56 0.3 undecidable manual S 238 52.503 112 0.76 59
GU.PZZ.HHZ. 2023-08-22T18:16:50.55 0.3 undecidable manual P 254 109.4127 100 -0.38 63
GU.CIRO.HHZ. 2023-08-22T18:16:50.69 0.1 undecidable manual P 323 113.6973 99 -0.88 68
IV.MSSA.HHZ. 2023-08-22T18:16:49.83 0.3 undecidable manual P 121 99.4227 101 0.42 63
GU.RNCA.HHZ. 2023-08-22T18:16:49.37 0.3 undecidable manual S 131 53.0025 112 -0.54 66
IV.QLNO.HHZ. 2023-08-22T18:16:49.38 0.3 undecidable manual S 189 51.7038 113 -0.22 73
GU.MGRO.HHZ. 2023-08-22T18:16:49.50 0.3 undecidable manual P 212 96.6255 101 0.51 61
GU.BHB.HHZ. 2023-08-22T18:16:48.51 0.1 positive manual P 274 93.24 102 0.03 92
GU.TRAV.HHZ. 2023-08-22T18:16:48.86 0.1 undecidable manual P 326 97.4247 101 -0.26 87
GU.RSP.HHZ. 2023-08-22T18:16:48.85 0.1 undecidable manual P 294 101.0211 101 -0.81 73
4P.IT02A.HHZ. 2023-08-22T18:16:48.63 0.1 undecidable manual P 356 93.1401 102 0.17 90
GU.RORO.HHZ. 2023-08-22T18:16:46.73 0.1 undecidable manual P 202 80.4639 104 0.17 91
4P.IT01A.HHZ. 2023-08-22T18:16:45.88 0.1 undecidable manual P 21 70.5738 106 0.79 79
GU.GORR.HHZ. 2023-08-22T18:16:45.09 0.1 undecidable manual P 106 69.5748 106 0.15 95
4P.IT03A.HHZ. 2023-08-22T18:16:44.23 0.3 undecidable manual P 346 51.7038 113 1.89 33
GU.CANO.HHZ. 2023-08-22T18:16:44.48 0.1 undecidable manual P 195 66.1893 107 0.04 96
IV.MONC.HHZ. 2023-08-22T18:16:43.40 0.1 undecidable manual P 308 51.8037 113 1.04 72
GU.PCP.HHZ. 2023-08-22T18:16:43.03 0.3 undecidable manual S 164 28.1496 130 -1.15 54
4P.IT06A.HHZ. 2023-08-22T18:16:43.00 0.1 undecidable manual P 238 52.503 112 0.55 87
GU.RNCA.HHZ. 2023-08-22T18:16:42.00 0.1 undecidable manual P 131 53.0025 112 -0.52 89
IV.QLNO.HHZ. 2023-08-22T18:16:42.33 0.1 undecidable manual P 189 51.7038 113 -0.02 100
GU.ROTM.HHZ. 2023-08-22T18:16:40.56 0.3 undecidable manual S 314 10.2786 158 -0.73 67
IV.SARZ.HNZ. 2023-08-22T18:16:40.94 0.1 undecidable manual P 76 37.9287 121 0.5 93
GU.PCP.HHZ. 2023-08-22T18:16:38.71 0.1 undecidable manual P 164 28.1496 130 -0.5 94
GU.ROTM.HHZ. 2023-08-22T18:16:36.97 0.1 undecidable manual P 314 10.2786 158 -0.58 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.ROTM.HHN. ML:3.0 0.005809999999999999 0.36 AML other m 2023-08-22T18:16:40.75
GU.ROTM.HHE. ML:3.0 0.005205 0.26 AML other m 2023-08-22T18:16:40.80
GU.PCP.HHE. ML:2.3 0.0007019999999999999 0.46 AML other m 2023-08-22T18:16:43.37
GU.PCP.HHN. ML:2.2 0.0005489999999999999 0.9 AML other m 2023-08-22T18:16:43.49
IV.QLNO.HHE. ML:1.8 0.0001465 0.72 AML other m 2023-08-22T18:16:49.14
IV.QLNO.HHN. ML:1.9 0.0001725 0.62 AML other m 2023-08-22T18:16:50.40
GU.RNCA.HHN. ML:2.3 0.00042300000000000004 1.64 AML other m 2023-08-22T18:16:50.85
4P.IT06A.HHN. ML:2.4 0.000573 1.04 AML other m 2023-08-22T18:16:51.62
4P.IT06A.HHE. ML:2.5 0.0006965 0.48 AML other m 2023-08-22T18:16:51.63
GU.IMI.HHN. ML:1.9 0.00007025000000000001 0.4 AML other m 2023-08-22T18:16:51.64
GU.RNCA.HHE. ML:2.3 0.00042200000000000007 1.02 AML other m 2023-08-22T18:16:51.74
IV.MONC.HHE. ML:2.4 0.000569 0.34 AML other m 2023-08-22T18:16:55.78
IV.MONC.HHN. ML:2.4 0.0005489999999999999 1.56 AML other m 2023-08-22T18:16:56.78
GU.GORR.HHE. ML:2.1 0.0001835 1.36 AML other m 2023-08-22T18:16:56.20
GU.GORR.HHN. ML:2.2 0.000254 0.44 AML other m 2023-08-22T18:16:57.27
GU.CANO.HHN. ML:2.5 0.0005495000000000001 0.26 AML other m 2023-08-22T18:16:57.22
GU.CANO.HHE. ML:2.5 0.0005164999999999999 0.84 AML other m 2023-08-22T18:16:57.34
4P.IT01A.HHE. ML:2.5 0.000544 1.08 AML other m 2023-08-22T18:16:57.92
4P.IT01A.HHN. ML:2.5 0.0005335 1.84 AML other m 2023-08-22T18:16:58.92
GU.RORO.HHN. ML:1.9 0.00010055 0.44 AML other m 2023-08-22T18:16:59.26
4P.IT02A.HHN. ML:2.6 0.0004145 0.54 AML other m 2023-08-22T18:17:02.98
GU.MGRO.HNN. ML:2.0 0.0000958 1.46 AML other m 2023-08-22T18:17:03.04
GU.RORO.HHE. ML:1.9 0.0001105 1.42 AML other m 2023-08-22T18:17:03.15
GU.RSP.HHN. ML:1.3 0.000020150000000000002 1.18 AML other m 2023-08-22T18:17:03.84
4P.IT02A.HHE. ML:2.4 0.00026450000000000003 0.56 AML other m 2023-08-22T18:17:03.89
GU.MGRO.HHN. ML:2.0 0.00009695000000000001 0.58 AML other m 2023-08-22T18:17:04.33
GU.MGRO.HHE. ML:2.0 0.00010400000000000001 0.62 AML other m 2023-08-22T18:17:04.92
GU.CIRO.HHN. ML:2.0 0.00007735 0.32 AML other m 2023-08-22T18:17:05.72
GU.CIRO.HHE. ML:2.0 0.00007955000000000001 0.26 AML other m 2023-08-22T18:17:06.37
GU.RSP.HHE. ML:1.3 0.0000203 0.62 AML other m 2023-08-22T18:17:06.56
GU.IMI.HHE. ML:2.0 0.00009125 1.3 AML other m 2023-08-22T18:17:07.22
GU.STV.HHN. ML:2.1 0.0001032 0.38 AML other m 2023-08-22T18:17:07.74
GU.PZZ.HHE. ML:2.2 0.000144 0.38 AML other m 2023-08-22T18:17:07.80
FR.SAOF.HHN.00 ML:2.0 0.00007005 0.68 AML other m 2023-08-22T18:17:07.57
GU.LSD.HHE. ML:1.7 0.0000346 0.2 AML other m 2023-08-22T18:17:08.55
GU.STV.HHE. ML:2.2 0.00013550000000000001 0.42 AML other m 2023-08-22T18:17:08.88
GU.SATI.HHN. ML:2.6 0.0002455 0.54 AML other m 2023-08-22T18:17:10.09
GU.SATI.HNN. ML:2.6 0.0002415 0.54 AML other m 2023-08-22T18:17:10.10
GU.SATI.HHE. ML:2.6 0.00027850000000000005 0.72 AML other m 2023-08-22T18:17:10.18
GU.SATI.HNE. ML:2.6 0.0002755 0.72 AML other m 2023-08-22T18:17:10.18
FR.SAOF.HHE.00 ML:2.0 0.00006920000000000002 0.36 AML other m 2023-08-22T18:17:10.03
GU.PZZ.HHN. ML:2.2 0.000122 0.4 AML other m 2023-08-22T18:17:10.68
GU.MGRO.HNE. ML:2.3 0.00019627500000000001 0.8 AML other m 2023-08-22T18:17:10.56
CH.MUGIO.HHN. ML:2.0 0.00006105 0.5 AML other m 2023-08-22T18:17:11.47
GU.RRL.HHN. ML:1.8 0.000036 1.42 AML other m 2023-08-22T18:17:11.15
IV.PLMA.HHE. ML:2.2 0.0000819 0.44 AML other m 2023-08-22T18:17:12.50
GU.LSD.HHN. ML:1.7 0.0000298 0.16 AML other m 2023-08-22T18:17:12.53
CH.MUGIO.HHE. ML:1.9 0.000050900000000000004 1.84 AML other m 2023-08-22T18:17:13.95
GU.RRL.HHE. ML:1.7 0.000031 0.82 AML other m 2023-08-22T18:17:13.25
IV.PLMA.HHN. ML:2.1 0.00007615 0.72 AML other m 2023-08-22T18:17:13.78
CH.MMK.HHN. ML:1.8 0.000035799999999999996 0.18 AML other m 2023-08-22T18:17:13.80
CH.MMK.HHE. ML:1.8 0.000031899999999999996 0.58 AML other m 2023-08-22T18:17:14.52
IV.MRGE.HHE. ML:1.9 0.0000348 0.48 AML other m 2023-08-22T18:17:16.65
IV.MDI.HHE. ML:2.4 0.00014500000000000003 0.14 AML other m 2023-08-22T18:17:16.91
IV.MRGE.HHN. ML:1.9 0.00003655 1.78 AML other m 2023-08-22T18:17:16.09
IV.MDI.HHN. ML:2.4 0.00011949999999999999 1.3 AML other m 2023-08-22T18:17:17.33
CH.FUSIO.HHE. ML:2.2 0.00005105 0.4 AML other m 2023-08-22T18:17:23.54
CH.DIX.HHN. ML:2.4 0.00010835 0.62 AML other m 2023-08-22T18:17:24.37
CH.DIX.HHE. ML:2.3 0.00008444999999999999 1.3 AML other m 2023-08-22T18:17:24.80
CH.FUSIO.HHN. ML:2.1 0.0000468 0.34 AML other m 2023-08-22T18:17:25.42
RD.ORIF.BHE. ML:1.8 0.0000177 1.64 AML other m 2023-08-22T18:17:29.97
RD.ORIF.BHN. ML:1.8 0.0000203 1.44 AML other m 2023-08-22T18:17:31.21
IV.MABI.HHN. ML:2.1 0.000029150000000000004 0.12 AML other m 2023-08-22T18:17:33.59
IV.MABI.HHE. ML:2.0 0.000025399999999999997 1.48 AML other m 2023-08-22T18:17:36.12
CH.BNALP.HHE. ML:2.0 0.00001965 0.36 AML other m 2023-08-22T18:17:39.28
CH.BNALP.HHN. ML:1.8 0.00001655 0.78 AML other m 2023-08-22T18:17:39.01
SI.LUSI.HHE. ML:2.4 0.000056800000000000005 0.16 AML other m 2023-08-22T18:17:40.67
SI.LUSI.HHN. ML:2.7 0.00010915 1.04 AML other m 2023-08-22T18:17:41.75
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
Waveforms Seismic signals in miniseed + resp format Download