Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 11-08-2021 and time 04:09:18 (UTC) in region 4 km NE Alseno (PC)

A magnitude ML 1.9 earthquake occured in region: 4 km NE Alseno (PC), on

  • 11-08-2021 04:09:18 (UTC)
  • 11-08-2021 06:09:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.9270, 9.9970 at 27 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
Alseno PC 4 4714 4714
Fiorenzuola d'Arda PC 7 15297 20011
Busseto PR 7 7054 27065
Besenzone PC 8 978 28043
Fidenza PR 8 26770 54813
Cortemaggiore PC 9 4644 59457
Soragna PR 10 4834 64291
Villanova sull'Arda PC 11 1811 66102
San Pietro in Cerro PC 11 878 66980
Cadeo PC 12 6118 73098
Salsomaggiore Terme PR 12 19831 92929
Polesine Zibello PR 13 3232 96161
Castell'Arquato PC 13 4713 100874
Fontanellato PR 15 7033 107907
Fontevivo PR 16 5597 113504
Carpaneto Piacentino PC 16 7715 121219
Caorso PC 17 4749 125968
Lugagnano Val d'Arda PC 18 4116 130084
Stagno Lombardo CR 18 1554 131638
San Secondo Parmense PR 18 5721 137359
Pontenure PC 18 6512 143871
Monticelli d'Ongina PC 19 5302 149173
Castelvetro Piacentino PC 19 5456 154629
Vernasca PC 19 2131 156760
Noceto PR 19 13001 169761
Roccabianca PR 20 3068 172829

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km S of Cremona (71901 inhabitants)
28 Km SE of Piacenza (102191 inhabitants)
30 Km W of Parma (192836 inhabitants)
56 Km W of Reggio nell'Emilia (171345 inhabitants)
71 Km S of Brescia (196480 inhabitants)
72 Km E of Pavia (72576 inhabitants)
72 Km W of Carpi (70699 inhabitants)
80 Km W of Modena (184973 inhabitants)
87 Km SE of Milano (1345851 inhabitants)
89 Km SE of Bergamo (119381 inhabitants)
90 Km SE of Sesto San Giovanni (81608 inhabitants)
92 Km N of La Spezia (93959 inhabitants)
93 Km SE of Monza (122671 inhabitants)
93 Km SE of Cinisello Balsamo (75078 inhabitants)
95 Km N of Carrara (63133 inhabitants)
97 Km SW of Verona (258765 inhabitants)
99 Km E of Vigevano (63310 inhabitants)
100 Km N of Massa (69479 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 1.9 2021-08-11
04:09:18		 44.9268 9.997 27 2021-12-29
11:12:33		 Bollettino Sismico Italiano INGV 95986161
Reviewed
Rev100 		ML 1.8 2021-08-11
04:09:18		 44.9508 10.0245 4 2021-08-11
04:26:08		 Sala Sismica INGV-Roma 93945871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-11 04:09:18 ± 0.12
Latitude 44.9268 ± 0.0072
Longitude 9.9970 ± 0.0165
Depth (km) 27 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95986161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1157
Semi-minor axis of confidence ellipse (meter) 632
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 277
Circular confidence region, given by single value of horizontal uncertainty (meter) 1160.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
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) 0.22123
Epicentral distance of station farthest from the epicenter (degree) 1.26804
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 20
Type of magnitude ML
Reference to an origin 93945871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-11 04:26:08

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 27
Type of magnitude ML
Reference to an origin 95986161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-18 17:19:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.DOSS.HHZ. 2021-08-11T04:09:58.08 0.6 undecidable manual S 41 140.748 54 0.2 60
SI.LUSI.HHZ. 2021-08-11T04:09:57.13 0.6 undecidable manual S 32 136.1637 54 0.23 60
ST.RONC.EHZ. 2021-08-11T04:09:55.30 0.6 undecidable manual S 22 126.5733 54 0.47 58
IV.MABI.HHZ. 2021-08-11T04:09:55.48 0.6 undecidable manual S 18 131.4684 54 -0.39 57
IV.ROVR.HHZ. 2021-08-11T04:09:52.53 0.6 undecidable manual S 46 115.7952 99 0.17 63
IV.MAGA.HHZ. 2021-08-11T04:09:50.22 1.0 undecidable manual S 27 106.2159 100 0.39 30
IV.MDI.HHZ. 2021-08-11T04:09:47.22 0.6 undecidable manual S 347 96.0261 101 0.07 66
IV.ZONE.HHZ. 2021-08-11T04:09:46.90 0.6 undecidable manual S 6 93.3399 101 0.47 61
ST.DOSS.HHZ. 2021-08-11T04:09:41.65 0.3 undecidable manual P 41 140.748 54 0.36 87
IV.SGAL.EHZ. 2021-08-11T04:09:41.20 0.6 undecidable manual S 19 74.7696 105 -0.41 65
SI.LUSI.HHZ. 2021-08-11T04:09:40.23 0.3 undecidable manual P 32 136.1637 54 -0.5 83
IV.MABI.HHZ. 2021-08-11T04:09:39.87 0.3 undecidable manual P 18 131.4684 54 -0.27 89
ST.RONC.EHZ. 2021-08-11T04:09:39.68 0.3 undecidable manual P 22 126.5733 54 0.15 93
IV.ROVR.HHZ. 2021-08-11T04:09:37.88 0.3 undecidable manual P 46 115.7952 99 -0.23 93
IV.MAGA.HHZ. 2021-08-11T04:09:36.36 0.3 undecidable manual P 27 106.2159 100 -0.29 94
IV.MDI.HHZ. 2021-08-11T04:09:35.23 0.6 undecidable manual P 347 96.0261 101 0.13 66
IV.ZONE.HHZ. 2021-08-11T04:09:34.94 0.3 undecidable manual P 6 93.3399 101 0.25 97
GU.GSCL.HHN. 2021-08-11T04:09:33.80 1.0 undecidable manual P 144 79.1652 104 1.24 23
IV.MSSA.HHE. 2021-08-11T04:09:33.17 0.3 undecidable manual P 209 77.5668 104 0.84 83
IV.SGAL.EHZ. 2021-08-11T04:09:31.60 0.3 undecidable manual P 19 74.7696 105 -0.3 100
GU.GORR.HHE. 2021-08-11T04:09:30.80 0.6 undecidable manual P 238 65.8896 107 0.22 68
IV.PCN.EHZ. 2021-08-11T04:09:29.46 0.6 undecidable manual S 299 24.5532 134 -0.11 77
GU.GRAM.HHZ. 2021-08-11T04:09:27.53 0.3 undecidable manual P 174 48.7179 113 -0.57 97
IV.PCN.EHZ. 2021-08-11T04:09:24.39 0.6 undecidable manual P 299 24.5532 134 -0.56 70
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GRAM.HHN. ML:1.6 0.00008592147 0.4192 AML other m 2021-08-11T04:09:37.61
GU.GRAM.HHE. ML:1.4 0.000056999099999999994 0.4992 AML other m 2021-08-11T04:09:38.43
IV.SGAL.EHE. ML:1.4 0.00003875 0.62 AML other m 2021-08-11T04:09:45.55
IV.SGAL.EHN. ML:1.2 0.000025128945 0.24 AML other m 2021-08-11T04:09:46.03
IV.MDI.HHN. ML:1.9 0.0000766 0.24 AML other m 2021-08-11T04:09:48.90
IV.ZONE.HHE. ML:1.9 0.0000839 0.16 AML other m 2021-08-11T04:09:48.91
IV.ZONE.HHN. ML:2.0 0.00010045 0.14 AML other m 2021-08-11T04:09:49.26
IV.MDI.HHE. ML:1.6 0.000046492215 0.2784 AML other m 2021-08-11T04:09:50.01
IV.ZONE.HNE. ML:2.0 0.00010650341 2.24 AML other m 2021-08-11T04:09:51.31
IV.MAGA.HHN. ML:1.9 0.0000664 0.26 AML other m 2021-08-11T04:09:51.33
IV.MAGA.HHE. ML:2.1 0.00011549999999999999 0.34 AML other m 2021-08-11T04:09:52.76
IV.ROVR.HNN. ML:2.1 0.000091293715 1.0112 AML other m 2021-08-11T04:09:53.03
IV.ZONE.HNN. ML:2.1 0.0001376036 0.8384 AML other m 2021-08-11T04:09:53.33
IV.ROVR.HNE. ML:2.2 0.000116981695 1.6896 AML other m 2021-08-11T04:09:54.79
IV.ROVR.HHE. ML:1.6 0.0000323 1.52 AML other m 2021-08-11T04:09:55.99
IV.ROVR.HHN. ML:2.0 0.0000686 0.22 AML other m 2021-08-11T04:09:56.17
IV.MABI.HHE. ML:1.7 0.00002755 1.66 AML other m 2021-08-11T04:09:56.03
ST.RONC.EHE. ML:2.2 0.000096911345 0.3808 AML other m 2021-08-11T04:09:57.44
ST.RONC.EHN. ML:2.2 0.00011634853500000001 0.1792 AML other m 2021-08-11T04:09:57.90
IV.MABI.HHN. ML:1.5 0.000021646145 0.2592 AML other m 2021-08-11T04:09:58.06
SI.LUSI.HHN. ML:2.4 0.000129 0.28 AML other m 2021-08-11T04:09:58.76
SI.LUSI.HHE. ML:1.9 0.00005126552 0.1984 AML other m 2021-08-11T04:09:59.49
ST.DOSS.HNE. ML:2.2 0.00009570680000000001 1.7184 AML other m 2021-08-11T04:09:59.99
ST.RONC.HNE. ML:2.7 0.00035051695 3.28 AML other m 2021-08-11T04:10:00.93
ST.DOSS.HHE. ML:1.6 0.0000206 0.62 AML other m 2021-08-11T04:10:00.68
ST.RONC.HNN. ML:2.8 0.0004194472 2.3008 AML other m 2021-08-11T04:10:00.06
ST.DOSS.HHN. ML:1.6 0.0000218 0.64 AML other m 2021-08-11T04:10:03.41
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