Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 11-08-2021 and time 03:59:47 (UTC) in region 4 km N Alseno (PC)

A magnitude ML 2.1 earthquake occured in region: 4 km N Alseno (PC), on

  • 11-08-2021 03:59:47 (UTC)
  • 11-08-2021 05:59:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.9360, 9.9640 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Alseno PC 4 4714 4714
Fiorenzuola d'Arda PC 4 15297 20011
Besenzone PC 6 978 20989
Cortemaggiore PC 7 4644 25633
Busseto PR 8 7054 32687
Cadeo PC 9 6118 38805
San Pietro in Cerro PC 10 878 39683
Villanova sull'Arda PC 10 1811 41494
Fidenza PR 11 26770 68264
Castell'Arquato PC 12 4713 72977
Soragna PR 13 4834 77811
Salsomaggiore Terme PR 13 19831 97642
Polesine Zibello PR 14 3232 100874
Carpaneto Piacentino PC 14 7715 108589
Caorso PC 15 4749 113338
Pontenure PC 16 6512 119850
Lugagnano Val d'Arda PC 17 4116 123966
Monticelli d'Ongina PC 17 5302 129268
Fontanellato PR 18 7033 136301
San Giorgio Piacentino PC 18 5792 142093
Castelvetro Piacentino PC 18 5456 147549
Stagno Lombardo CR 18 1554 149103
Vernasca PC 18 2131 151234
Fontevivo PR 19 5597 156831
Gerre de' Caprioli CR 20 1319 158150

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km S of Cremona (71901 inhabitants)
25 Km SE of Piacenza (102191 inhabitants)
32 Km W of Parma (192836 inhabitants)
59 Km W of Reggio nell'Emilia (171345 inhabitants)
69 Km E of Pavia (72576 inhabitants)
70 Km SW of Brescia (196480 inhabitants)
75 Km W of Carpi (70699 inhabitants)
83 Km W of Modena (184973 inhabitants)
85 Km SE of Milano (1345851 inhabitants)
88 Km S of Bergamo (119381 inhabitants)
88 Km SE of Sesto San Giovanni (81608 inhabitants)
90 Km SE of Monza (122671 inhabitants)
91 Km SE of Cinisello Balsamo (75078 inhabitants)
93 Km N of La Spezia (93959 inhabitants)
96 Km N of Carrara (63133 inhabitants)
96 Km E of Vigevano (63310 inhabitants)
98 Km SE of Rho (50434 inhabitants)
98 Km SW of Verona (258765 inhabitants)
100 Km NE of Genova (586655 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 2021-08-11
03:59:47		 44.9362 9.9642 28 2021-12-29
11:12:33		 Bollettino Sismico Italiano INGV 95948781
Reviewed
Rev100 		ML 2.0 2021-08-11
03:59:47		 44.9673 9.8858 29 2021-08-11
12:08:20		 Sala Sismica INGV-Roma 93964951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-11 03:59:47 ± 0.09
Latitude 44.9362 ± 0.0063
Longitude 9.9642 ± 0.0140
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 95948781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1019
Semi-minor axis of confidence ellipse (meter) 585
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 286
Circular confidence region, given by single value of horizontal uncertainty (meter) 1020.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.19605
Epicentral distance of station farthest from the epicenter (degree) 1.74468
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 30
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 93964951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-11 12:08:20

ML:2.1

Field Value
Value 2.1
Uncertainty 0.4
Num. used stations 63
Type of magnitude ML
Reference to an origin 95948781
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-18 17:15:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.CARE.EHZ. 2021-08-11T04:00:35.10 0.6 undecidable manual S 19 174.5919 54 1.1 30
ST.GAGG.HHZ. 2021-08-11T04:00:28.90 0.6 undecidable manual S 31 148.9398 54 0.44 44
ST.DOSS.HHZ. 2021-08-11T04:00:27.32 0.6 undecidable manual S 42 141.6471 54 0.42 45
SI.LUSI.HHZ. 2021-08-11T04:00:25.90 0.3 undecidable manual S 34 136.7631 54 0.07 73
IV.MABI.HHZ. 2021-08-11T04:00:24.89 0.6 undecidable manual S 19 131.2686 54 0.23 48
OX.MARN.HHZ. 2021-08-11T04:00:23.24 0.3 undecidable manual S 51 124.5864 54 0.04 76
ST.RONC.EHZ. 2021-08-11T04:00:23.88 0.6 undecidable manual S 24 126.6732 54 0.22 48
ST.VARA.EHZ. 2021-08-11T04:00:22.89 0.6 undecidable manual S 36 122.5884 54 0.11 50
IV.ROVR.HHZ. 2021-08-11T04:00:21.78 0.6 undecidable manual S 47 116.994 99 0.27 49
IV.MAGA.HHZ. 2021-08-11T04:00:18.97 0.6 undecidable manual S 29 106.5156 100 0.22 50
IV.ZEN8.EHZ. 2021-08-11T04:00:16.91 0.6 undecidable manual S 37 98.2239 101 0.34 50
IV.MDI.HHZ. 2021-08-11T04:00:16.07 0.6 undecidable manual S 348 94.4388 101 0.48 48
ST.ZIAN.EHZ. 2021-08-11T04:00:16.88 0.3 undecidable manual P 39 193.6617 54 0.17 56
IV.ZONE.HHZ. 2021-08-11T04:00:15.98 0.6 undecidable manual S 7 92.5407 102 0.89 41
IV.SALO.HHZ. 2021-08-11T04:00:14.94 0.3 undecidable manual S 30 87.4458 102 1.2 54
ST.CARE.EHZ. 2021-08-11T04:00:14.09 0.6 undecidable manual P 19 174.5919 54 -0.25 41
IV.CTI.HHZ. 2021-08-11T04:00:14.63 0.3 undecidable manual P 46 179.9865 54 -0.38 57
IV.SGAL.EHZ. 2021-08-11T04:00:10.04 0.6 undecidable manual S 21 74.6697 105 -0.4 52
IV.PII.HHZ. 2021-08-11T04:00:10.82 0.6 undecidable manual P 162 141.8469 54 0.56 44
ST.GAGG.HHZ. 2021-08-11T04:00:10.82 0.3 undecidable manual P 31 148.9398 54 -0.32 67
GU.MAIM.HHZ. 2021-08-11T04:00:09.35 0.6 undecidable manual P 160 120.8901 54 1.69 26
SI.LUSI.HHZ. 2021-08-11T04:00:09.03 0.3 undecidable manual P 34 136.7631 54 -0.59 64
ST.DOSS.HHZ. 2021-08-11T04:00:09.80 0.3 undecidable manual P 42 141.6471 54 -0.44 67
GU.GORR.HHZ. 2021-08-11T04:00:08.21 0.6 undecidable manual S 236 64.2912 107 0.44 52
ST.RONC.EHZ. 2021-08-11T04:00:08.18 0.3 undecidable manual P 24 126.6732 54 -0.19 73
GU.PCP.HHZ. 2021-08-11T04:00:08.95 0.6 undecidable manual P 249 120.0909 54 1.4 31
IV.MABI.HHZ. 2021-08-11T04:00:08.70 0.3 undecidable manual P 19 131.2686 54 -0.24 71
GU.POPM.HHZ. 2021-08-11T04:00:07.76 0.6 undecidable manual P 147 117.0939 99 0.62 45
ST.VARA.EHZ. 2021-08-11T04:00:07.46 0.3 undecidable manual P 36 122.5884 54 -0.4 70
OX.MARN.HHZ. 2021-08-11T04:00:07.48 0.3 undecidable manual P 51 124.5864 54 -0.62 65
IV.ROVR.HHZ. 2021-08-11T04:00:06.64 0.1 undecidable manual P 47 116.994 99 -0.49 93
GU.CARD.HHZ. 2021-08-11T04:00:06.15 0.6 undecidable manual P 158 108.9132 100 0.25 50
IV.MAGA.HHZ. 2021-08-11T04:00:05.14 0.1 undecidable manual P 29 106.5156 100 -0.39 97
IV.MERA.HNE. 2021-08-11T04:00:04.51 0.3 undecidable manual P 334 95.0382 101 0.72 66
GU.GRAM.HHZ. 2021-08-11T04:00:04.65 0.6 undecidable manual S 171 50.1165 113 0.44 54
GU.SARM.EHN. 2021-08-11T04:00:03.33 0.3 undecidable manual P 157 90.243 102 0.25 78
IV.ZONE.HHZ. 2021-08-11T04:00:03.37 0.3 undecidable manual P 7 92.5407 102 -0.05 81
IV.ZEN8.EHZ. 2021-08-11T04:00:03.64 0.3 undecidable manual P 37 98.2239 101 -0.64 69
IV.BOB.HHN. 2021-08-11T04:00:03.10 0.6 undecidable manual S 246 44.7219 116 0.2 56
IV.MDI.HHZ. 2021-08-11T04:00:03.64 0.3 undecidable manual P 348 94.4388 101 -0.07 80
IV.SALO.HHZ. 2021-08-11T04:00:02.64 0.6 undecidable manual P 30 87.4458 102 0 55
GU.GSCL.HHN. 2021-08-11T04:00:02.28 0.3 undecidable manual P 143 81.4518 103 0.53 75
IV.MSSA.HHZ. 2021-08-11T04:00:01.56 0.6 undecidable manual P 207 77.2671 104 0.44 51
IV.SGAL.EHZ. 2021-08-11T04:00:00.33 0.6 undecidable manual P 21 74.6697 105 -0.4 52
GU.GORR.HHZ. 2021-08-11T03:59:58.53 0.1 undecidable manual P 236 64.2912 107 -0.66 97
IV.PCN.EHZ. 2021-08-11T03:59:58.28 0.6 undecidable manual S 300 21.7671 138 0.36 56
GU.GRAM.HHZ. 2021-08-11T03:59:56.33 0.3 undecidable manual P 171 50.1165 113 -0.81 70
IV.BOB.HHN. 2021-08-11T03:59:55.79 0.3 undecidable manual P 246 44.7219 116 -0.59 78
IV.PCN.EHZ. 2021-08-11T03:59:52.70 0.1 undecidable manual P 300 21.7671 138 -0.81 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SGAL.EHE. ML:1.9 0.000111 0.08 AML other m 2021-08-11T04:00:14.44
IV.SGAL.EHN. ML:1.7 0.00007092998 0.2176 AML other m 2021-08-11T04:00:14.92
IV.ZONE.HNN. ML:2.1 0.00012746235 1.2992 AML other m 2021-08-11T04:00:16.74
IV.SALO.HHE. ML:1.9 0.0000857 0.28 AML other m 2021-08-11T04:00:16.71
IV.MDI.HHN. ML:2.3 0.000219 0.26 AML other m 2021-08-11T04:00:17.79
IV.ZONE.HHE. ML:2.3 0.0002104412 0.1632 AML other m 2021-08-11T04:00:17.87
IV.ZEN8.EHN. ML:1.6 0.000039287919999999995 0.2176 AML other m 2021-08-11T04:00:17.78
IV.ZEN8.HNN. ML:3.2 0.001734121 0.7584 AML other m 2021-08-11T04:00:17.95
IV.ZEN8.HNE. ML:3.4 0.00254 1.24 AML other m 2021-08-11T04:00:17.96
IV.ZEN8.EHE. ML:1.6 0.000036825045000000004 0.2624 AML other m 2021-08-11T04:00:18.02
IV.ZONE.HHN. ML:2.4 0.0002665 0.14 AML other m 2021-08-11T04:00:18.14
IV.MDI.HHE. ML:2.1 0.00012049438000000002 0.3008 AML other m 2021-08-11T04:00:18.89
IV.SALO.HHN. ML:1.9 0.000087242375 0.4416 AML other m 2021-08-11T04:00:18.98
IV.SALO.HNN. ML:2.1 0.00014383035 0.4608 AML other m 2021-08-11T04:00:19.20
IV.ZONE.HNE. ML:1.6 0.00004581998500000001 0.5376 AML other m 2021-08-11T04:00:19.55
IV.MBAL.HNE. ML:2.5 0.00026212364999999996 0.7008 AML other m 2021-08-11T04:00:19.83
IV.SALO.HNE. ML:2.0 0.00011037996 0.56 AML other m 2021-08-11T04:00:20.17
IV.MSSA.HHN. ML:1.5 0.000047300000000000005 0.26 AML other m 2021-08-11T04:00:20.17
IV.MSSA.HHE. ML:1.6 0.00005678169 0.1024 AML other m 2021-08-11T04:00:20.47
IV.MAGA.HHN. ML:2.4 0.000193 0.32 AML other m 2021-08-11T04:00:21.23
IV.MAGA.HHE. ML:2.6 0.0003085 0.32 AML other m 2021-08-11T04:00:21.65
IV.ROVR.HNN. ML:2.2 0.00012198829999999999 0.7104 AML other m 2021-08-11T04:00:24.23
IV.ROVR.HHE. ML:2.0 0.0000766 1 AML other m 2021-08-11T04:00:24.87
IV.ROVR.HHN. ML:2.4 0.0001705 0.2 AML other m 2021-08-11T04:00:25.06
ST.VARA.HNE. ML:2.2 0.00009841136 0.16 AML other m 2021-08-11T04:00:25.50
OX.MARN.HHN. ML:2.2 0.00010525 0.94 AML other m 2021-08-11T04:00:25.64
OX.MARN.HNN. ML:2.1 0.00008994447499999999 0.1792 AML other m 2021-08-11T04:00:25.64
ST.RONC.HNE. ML:2.7 0.00034974375 0.2016 AML other m 2021-08-11T04:00:25.76
OX.MARN.HHE. ML:2.2 0.00009670317000000001 0.3424 AML other m 2021-08-11T04:00:25.67
IV.MABI.HHE. ML:2.1 0.00007465 0.36 AML other m 2021-08-11T04:00:25.92
ST.VARA.HNN. ML:2.5 0.00022904103 0.3424 AML other m 2021-08-11T04:00:26.15
ST.RONC.EHE. ML:2.6 0.00026810485 0.3776 AML other m 2021-08-11T04:00:26.34
CH.MUGIO.HHN. ML:1.6 0.000024500000000000003 0.42 AML other m 2021-08-11T04:00:26.22
IV.MABI.HHN. ML:2.0 0.00005563357500000001 0.32 AML other m 2021-08-11T04:00:26.32
ST.VARA.EHE. ML:2.6 0.00025070995 0.3392 AML other m 2021-08-11T04:00:26.16
GU.CARD.HHE. ML:1.6 0.000034916625 0.32 AML other m 2021-08-11T04:00:26.78
ST.RONC.EHN. ML:2.7 0.000319 0.18 AML other m 2021-08-11T04:00:26.80
ST.VARA.EHN. ML:1.3 0.00001740295 4.0416 AML other m 2021-08-11T04:00:27.10
GU.CARD.HHN. ML:1.6 0.0000315 1.36 AML other m 2021-08-11T04:00:27.87
SI.LUSI.HHN. ML:2.8 0.000358 0.3 AML other m 2021-08-11T04:00:27.65
SI.LUSI.HHE. ML:2.4 0.00013550000000000001 0.14 AML other m 2021-08-11T04:00:28.29
CH.MUGIO.HHE. ML:1.6 0.00002255 0.22 AML other m 2021-08-11T04:00:28.65
GU.POPM.HHN. ML:1.8 0.00004695 0.8 AML other m 2021-08-11T04:00:29.39
GU.MAIM.HHN. ML:1.4 0.00001926556 0.4992 AML other m 2021-08-11T04:00:29.42
GU.MAIM.HHE. ML:1.2 0.000012132158 0.7424 AML other m 2021-08-11T04:00:30.02
ST.GAGG.HHN. ML:1.9 0.000040499999999999995 0.34 AML other m 2021-08-11T04:00:30.06
IV.ROVR.HNE. ML:2.2 0.00012395686 0.9088 AML other m 2021-08-11T04:00:30.47
GU.POPM.HHE. ML:1.6 0.00002845925 0.3232 AML other m 2021-08-11T04:00:30.96
ST.GAGG.HHE. ML:2.2 0.0000868 1.76 AML other m 2021-08-11T04:00:30.07
ST.GAGG.HNN. ML:2.3 0.00009296763499999999 0.3616 AML other m 2021-08-11T04:00:31.07
IV.PII.HHE. ML:1.7 0.000025035574999999996 0.2976 AML other m 2021-08-11T04:00:31.53
ST.GAGG.HNE. ML:2.2 0.00008611098 0.6176 AML other m 2021-08-11T04:00:32.32
ST.DOSS.HHN. ML:2.0 0.00005885 0.54 AML other m 2021-08-11T04:00:33.64
ST.DOSS.HHE. ML:2.0 0.00005719452 0.4384 AML other m 2021-08-11T04:00:33.77
IV.PII.HHN. ML:1.6 0.000019564305000000002 0.2208 AML other m 2021-08-11T04:00:34.42
ST.CARE.EHN. ML:2.0 0.000037731845 0.32 AML other m 2021-08-11T04:00:37.08
ST.CARE.EHE. ML:1.9 0.000031346815 0.56 AML other m 2021-08-11T04:00:38.10
GU.CANO.HHN. ML:1.5 0.0000174 0.98 AML other m 2021-08-11T04:00:38.16
ST.DOSS.HNE. ML:2.2 0.00008862771499999999 1.2576 AML other m 2021-08-11T04:00:39.49
IV.CTI.HHE. ML:2.1 0.000051699999999999996 0.18 AML other m 2021-08-11T04:00:39.90
IV.CTI.HHN. ML:2.2 0.00005495 0.74 AML other m 2021-08-11T04:00:39.90
OX.MARN.HNE. ML:3.3 0.001481082 1.8976 AML other m 2021-08-11T04:00:45.87
GU.CANO.HHE. ML:2.0 0.00003784999999999999 1.16 AML other m 2021-08-11T04:00:48.12
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