Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 19-10-2021 and time 09:18:28 (Italy) in region 2 km SE Pozzol Groppo (AL)

A magnitude ML 1.8 earthquake occured in region: 2 km SE Pozzol Groppo (AL), on

  • 19-10-2021 07:18:28 (UTC)
  • 19-10-2021 09:18:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.8620, 9.0450 at 19 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
Pozzol Groppo AL 2 328 328
Momperone AL 3 223 551
Cecima PV 3 236 787
Godiasco Salice Terme PV 4 3229 4016
Ponte Nizza PV 4 807 4823
Montemarzino AL 4 341 5164
Casasco AL 5 129 5293
Brignano-Frascata AL 5 456 5749
Monleale AL 5 566 6315
Volpedo AL 6 1227 7542
Rocca Susella PV 7 225 7767
Bagnaria PV 7 658 8425
Montegioco AL 8 313 8738
Volpeglino AL 8 148 8886
Berzano di Tortona AL 8 157 9043
Casalnoceto AL 8 980 10023
Rivanazzano Terme PV 8 5312 15335
Montesegale PV 8 298 15633
Gremiasco AL 9 324 15957
San Sebastiano Curone AL 9 583 16540
Avolasca AL 9 294 16834
Cerreto Grue AL 9 323 17157
Castellar Guidobono AL 9 399 17556
Garbagna AL 10 696 18252
Retorbido PV 10 1538 19790
Val di Nizza PV 10 624 20414
Costa Vescovato AL 10 335 20749
Sarezzano AL 10 1171 21920
Dernice AL 10 185 22105
Viguzzolo AL 11 3148 25253
Castellania AL 11 90 25343
Codevilla PV 12 997 26340
Montacuto AL 12 278 26618
Villaromagnano AL 12 715 27333
Varzi PV 13 3279 30612
Carezzano AL 13 431 31043
Sant'Agata Fossili AL 13 425 31468
Paderna AL 13 220 31688
Fortunago PV 13 390 32078
Torrazza Coste PV 13 1680 33758
Carbonara Scrivia AL 14 1122 34880
Spineto Scrivia AL 14 337 35217
Pontecurone AL 14 3723 38940
Borgoratto Mormorolo PV 14 432 39372
Borgo Priolo PV 14 1474 40846
Fabbrica Curone AL 15 656 41502
Valverde PV 15 287 41789
Tortona AL 15 27437 69226
Voghera PV 15 39421 108647
Villalvernia AL 16 955 109602
Gavazzana AL 16 180 109782
Cantalupo Ligure AL 16 527 110309
Sardigliano AL 16 406 110715
Montebello della Battaglia PV 16 1628 112343
Borghetto di Borbera AL 16 1966 114309
Calvignano PV 17 122 114431
Rocchetta Ligure AL 17 200 114631
Zavattarello PV 18 991 115622
Cassano Spinola AL 18 1731 117353
Albera Ligure AL 18 325 117678
Casteggio PV 18 6805 124483
Castelnuovo Scrivia AL 18 5274 129757
Santa Margherita di Staffora PV 18 473 130230
Montalto Pavese PV 18 890 131120
Casei Gerola PV 19 2500 133620
Oliva Gessi PV 19 176 133796
Pizzale PV 19 735 134531
Grondona AL 19 510 135041
Corvino San Quirico PV 19 1039 136080
Ruino PV 20 723 136803
Menconico PV 20 360 137163

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Alessandria (93943 inhabitants)
37 Km S of Pavia (72576 inhabitants)
51 Km N of Genova (586655 inhabitants)
53 Km S of Vigevano (63310 inhabitants)
55 Km W of Piacenza (102191 inhabitants)
66 Km E of Asti (76202 inhabitants)
68 Km S of Milano (1345851 inhabitants)
73 Km SE of Novara (104380 inhabitants)
74 Km S of Rho (50434 inhabitants)
76 Km NE of Savona (61345 inhabitants)
76 Km S of Sesto San Giovanni (81608 inhabitants)
79 Km S of Cinisello Balsamo (75078 inhabitants)
82 Km S of Legnano (60262 inhabitants)
82 Km S of Monza (122671 inhabitants)
83 Km W of Cremona (71901 inhabitants)
85 Km S of Busto Arsizio (83106 inhabitants)
91 Km S of Gallarate (53343 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 2021-10-19
07:18:28		 44.8618 9.0453 19 2022-03-30
13:04:14		 Bollettino Sismico Italiano INGV 97250681
Reviewed
Rev100 		ML 1.9 2021-10-19
07:18:28		 44.8542 9.0392 19 2021-10-19
07:30:59		 Sala Sismica INGV-Roma 96754791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-19 07:18:28 ± 0.11
Latitude 44.8618 ± 0.0063
Longitude 9.0453 ± 0.0102
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97250681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 763
Semi-minor axis of confidence ellipse (meter) 383
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 271
Circular confidence region, given by single value of horizontal uncertainty (meter) 760.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.26355
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 97250681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-21 14:50:52

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 96754791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-19 07:30:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CING.HHZ. 2021-10-19T07:20:02.23 3.0 undecidable manual Sn 2.09 0
IV.TST02.HHZ. 2021-10-19T07:19:54.47 3.0 undecidable manual Pg 14.27 0
IV.LNSS.HHZ. 2021-10-19T07:19:25.87 3.0 undecidable manual Pn 1.71 0
GU.IMI.HHZ. 2021-10-19T07:18:51.01 0.3 undecidable manual P 221 139.5603 94 -0.08 63
GU.BHB.HHZ. 2021-10-19T07:18:50.86 0.3 undecidable manual P 269 140.2485 94 -0.33 60
GU.MGRO.HHN. 2021-10-19T07:18:50.38 0.3 undecidable manual P 228 133.6662 94 0.21 62
GU.EQUI.HHN. 2021-10-19T07:18:48.81 0.6 undecidable manual P 131 116.7942 94 1.23 29
GU.TRAV.HHZ. 2021-10-19T07:18:48.53 0.3 undecidable manual P 306 124.5864 94 -0.26 63
GU.GBOS.HHZ. 2021-10-19T07:18:48.76 0.3 undecidable manual P 235 117.4935 94 1.06 47
IV.MDI.HHE. 2021-10-19T07:18:47.10 0.6 undecidable manual P 27 113.4975 95 0.02 45
CH.MUGIO.HHZ. 2021-10-19T07:18:47.66 0.3 undecidable manual P 360 117.5934 94 -0.05 67
IV.VARE.HHZ. 2021-10-19T07:18:47.18 0.3 undecidable manual P 349 113.5974 95 0.08 66
GU.RORO.HHE. 2021-10-19T07:18:47.19 0.6 undecidable manual P 223 113.5974 95 0.09 44
IV.PLMA.HHE. 2021-10-19T07:18:46.88 0.3 undecidable manual P 144 110.5005 95 0.26 64
GU.PCP.HHZ. 2021-10-19T07:18:44.92 0.6 undecidable manual S 228 53.1024 101 -0.04 50
GU.CANO.HHZ. 2021-10-19T07:18:44.66 0.3 undecidable manual P 222 96.7254 96 0.16 68
GU.GRAM.HHZ. 2021-10-19T07:18:44.09 0.6 undecidable manual P 117 90.3429 96 0.56 41
IV.MERA.HNE. 2021-10-19T07:18:44.84 0.6 undecidable manual P 18 98.2239 95 0.1 45
GU.RNCA.HHZ. 2021-10-19T07:18:42.71 0.3 undecidable manual S 190 43.9227 104 0.12 76
IV.QLNO.HHZ. 2021-10-19T07:18:41.87 0.6 undecidable manual P 223 81.252 97 -0.27 46
IV.MSSA.HHZ. 2021-10-19T07:18:40.22 0.3 undecidable manual P 148 71.0733 98 -0.36 69
GU.GORR.HHZ. 2021-10-19T07:18:40.07 0.6 undecidable manual S 145 34.3434 110 -0.05 52
IV.BOB.HNE. 2021-10-19T07:18:39.96 0.6 undecidable manual S 108 33.3444 110 0.09 52
GU.PCP.HHZ. 2021-10-19T07:18:37.22 0.3 undecidable manual P 228 53.1024 101 -0.62 66
GU.RNCA.HHZ. 2021-10-19T07:18:36.07 0.3 undecidable manual P 190 43.9227 104 -0.4 71
IV.SARZ.HHZ. 2021-10-19T07:18:35.07 0.3 undecidable manual S 273 10.3785 147 0.14 81
GU.GORR.HHZ. 2021-10-19T07:18:34.55 0.3 undecidable manual P 145 34.3434 110 -0.5 71
IV.BOB.HNE. 2021-10-19T07:18:34.65 0.1 undecidable manual P 108 33.3444 110 -0.25 100
IV.SARZ.HHZ. 2021-10-19T07:18:32.32 0.3 undecidable manual P 273 10.3785 147 0.27 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SARZ.HHN. ML:2.2 0.001315 0.34 AML other m 2021-10-19T07:18:35.10
IV.SARZ.HNN. ML:2.2 0.001295 0.34 AML other m 2021-10-19T07:18:35.10
IV.SARZ.HNE. ML:2.1 0.0010895 0.86 AML other m 2021-10-19T07:18:35.90
IV.SARZ.HHE. ML:2.2 0.0011099999999999999 0.88 AML other m 2021-10-19T07:18:35.90
GU.GORR.HHN. ML:1.7 0.00016800000000000002 1.46 AML other m 2021-10-19T07:18:40.21
GU.GORR.HHE. ML:1.6 0.00015900000000000002 1.32 AML other m 2021-10-19T07:18:41.88
GU.RNCA.HHE. ML:1.2 0.000042749999999999996 0.32 AML other m 2021-10-19T07:18:43.61
GU.RNCA.HHN. ML:1.2 0.000043450000000000006 1.08 AML other m 2021-10-19T07:18:44.44
IV.MSSA.HHE. ML:1.7 0.0000849 0.1 AML other m 2021-10-19T07:18:46.54
GU.PCP.HHN. ML:1.2 0.000033600000000000004 0.64 AML other m 2021-10-19T07:18:47.49
GU.PCP.HHE. ML:1.2 0.0000352 0.86 AML other m 2021-10-19T07:18:48.47
IV.MSSA.HHN. ML:1.6 0.00006865 0.1 AML other m 2021-10-19T07:18:51.77
GU.CANO.HHE. ML:2.2 0.0001455 1.08 AML other m 2021-10-19T07:19:01.13
GU.CANO.HHN. ML:2.1 0.0001215 0.36 AML other m 2021-10-19T07:19:01.18
CH.MUGIO.HHE. ML:1.6 0.000028049999999999997 0.3 AML other m 2021-10-19T07:19:03.56
CH.MUGIO.HHN. ML:1.6 0.00002785 0.32 AML other m 2021-10-19T07:19:03.62
GU.TRAV.HHE. ML:2.2 0.0001065 0.54 AML other m 2021-10-19T07:19:05.97
GU.TRAV.HHN. ML:2.1 0.00009534999999999999 0.26 AML other m 2021-10-19T07:19:05.74
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