Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 07-01-2021 and time 21:45:56 (Italy) in region 1 km SW Piovera (AL)

A magnitude ML 2.2 earthquake occured in region: 1 km SW Piovera (AL), on

  • 07-01-2021 20:45:56 (UTC)
  • 07-01-2021 21:45:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.9510, 8.7300 at 37 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
Piovera AL 1 851 851
Montecastello AL 3 321 1172
Rivarone AL 3 381 1553
Pietra Marazzi AL 5 904 2457
Bassignana AL 6 1709 4166
Alluvioni Cambiò AL 6 912 5078
Pecetto di Valenza AL 6 1267 6345
Sale AL 7 4172 10517
Suardi PV 9 624 11141
Gambarana PV 9 225 11366
Valenza AL 10 19178 30544
Alessandria AL 10 93943 124487
Frascarolo PV 11 1209 125696
Guazzora AL 12 305 126001
Tortona AL 12 27437 153438
Castelnuovo Scrivia AL 12 5274 158712
Pieve del Cairo PV 13 2063 160775
Frugarolo AL 13 1968 162743
Isola Sant'Antonio AL 13 717 163460
Torre Beretti e Castellaro PV 13 567 164027
Castelletto Monferrato AL 13 1537 165564
San Salvatore Monferrato AL 14 4299 169863
Alzano Scrivia AL 14 377 170240
Bosco Marengo AL 15 2457 172697
Molino dei Torti AL 15 605 173302
Casal Cermelli AL 15 1234 174536
Mezzana Bigli PV 15 1098 175634
Viguzzolo AL 16 3148 178782
Carbonara Scrivia AL 16 1122 179904
Villa Biscossi PV 16 78 179982
Pontecurone AL 16 3723 183705
Mede PV 16 6693 190398
Bozzole AL 16 319 190717
Pomaro Monferrato AL 17 355 191072
Villaromagnano AL 17 715 191787
Castellazzo Bormida AL 17 4570 196357
Casei Gerola PV 17 2500 198857
Spineto Scrivia AL 17 337 199194
Sarezzano AL 17 1171 200365
Giarole AL 18 718 201083
Solero AL 18 1645 202728
Villalvernia AL 18 955 203683
Cornale e Bastida PV 18 867 204550
Pozzolo Formigaro AL 18 4775 209325
Galliavola PV 18 211 209536
Castellar Guidobono AL 18 399 209935
Mirabello Monferrato AL 19 1374 211309
Fresonara AL 19 731 212040
Quargnento AL 19 1398 213438
Sartirana Lomellina PV 19 1657 215095
Paderna AL 19 220 215315
Volpeglino AL 19 148 215463
Berzano di Tortona AL 19 157 215620
Borgoratto Alessandrino AL 20 584 216204
Lomello PV 20 2206 218410
Silvano Pietra PV 20 672 219082
Castelspina AL 20 416 219498
Cerreto Grue AL 20 323 219821

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km E of Alessandria (93943 inhabitants)
42 Km E of Asti (76202 inhabitants)
42 Km S of Vigevano (63310 inhabitants)
43 Km SW of Pavia (72576 inhabitants)
56 Km S of Novara (104380 inhabitants)
62 Km N of Genova (586655 inhabitants)
68 Km SW of Milano (1345851 inhabitants)
69 Km SW of Rho (50434 inhabitants)
73 Km S of Legnano (60262 inhabitants)
74 Km N of Savona (61345 inhabitants)
75 Km S of Busto Arsizio (83106 inhabitants)
76 Km SW of Sesto San Giovanni (81608 inhabitants)
77 Km W of Piacenza (102191 inhabitants)
78 Km SW of Cinisello Balsamo (75078 inhabitants)
79 Km S of Gallarate (53343 inhabitants)
82 Km E of Moncalieri (57294 inhabitants)
82 Km SW of Monza (122671 inhabitants)
84 Km E of Torino (890529 inhabitants)
97 Km S of Varese (80799 inhabitants)
100 Km S of Como (84495 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 2.2 2021-01-07
20:45:56		 44.9508 8.7302 37 2021-07-12
16:55:08		 Bollettino Sismico Italiano INGV 89396941
Reviewed
Rev100 		ML 2.3 2021-01-07
20:45:56		 44.9485 8.7302 42 2021-01-07
20:54:25		 Sala Sismica INGV-Roma 86080001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-07 20:45:56 ± 0.09
Latitude 44.9508 ± 0.0072
Longitude 8.7302 ± 0.0102
Depth (km) 37 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89396941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 804
Semi-minor axis of confidence ellipse (meter) 632
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 800.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 46
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.15468
Epicentral distance of station farthest from the epicenter (degree) 3.20518
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 32
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 89396941
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-07 00:22:07

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 46
Type of magnitude ML
Reference to an origin 86080001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-07 20:54:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.GAGG.HHZ. 2021-01-07T20:46:49.55 0.6 undecidable manual S 53 214.0191 54 -0.12 28
NI.PALA.HHZ. 2021-01-07T20:46:44.96 0.3 undecidable manual P 65 355.7772 54 0.25 18
IV.STAL.HHZ. 2021-01-07T20:46:42.86 0.6 undecidable manual P 63 341.3028 54 -0.05 13
ST.ZIAN.EHZ. 2021-01-07T20:46:33.96 0.3 undecidable manual P 55 264.4353 54 0.61 26
GU.SATI.HHZ. 2021-01-07T20:46:31.23 0.6 undecidable manual S 327 122.5884 54 1.26 27
ST.PANI.EHZ. 2021-01-07T20:46:30.11 0.3 undecidable manual P 58 236.3856 54 0.26 35
IV.MDI.HHE. 2021-01-07T20:46:28.51 0.6 undecidable manual S 40 118.992 54 -0.69 35
GU.CIRO.HHZ. 2021-01-07T20:46:28.54 0.6 undecidable manual S 309 115.8951 54 0 43
GU.RORO.HHZ. 2021-01-07T20:46:27.04 0.6 undecidable manual S 210 106.8153 54 0.48 40
ST.GAGG.HHZ. 2021-01-07T20:46:27.50 0.3 undecidable manual P 53 214.0191 54 0.43 40
ST.DOSS.HHZ. 2021-01-07T20:46:27.34 0.3 undecidable manual P 61 217.4157 54 -0.16 40
CH.MUGIO.HHZ. 2021-01-07T20:46:26.72 0.6 undecidable manual S 13 110.4006 54 -0.63 37
SI.LUSI.HHZ. 2021-01-07T20:46:25.91 0.3 undecidable manual P 56 205.3389 54 -0.09 44
GU.TRAV.HHZ. 2021-01-07T20:46:24.71 0.6 undecidable manual S 309 98.9232 54 -0.16 44
ST.RONC.EHZ. 2021-01-07T20:46:24.12 0.1 undecidable manual P 52 186.369 54 0.49 61
GU.CANO.HHZ. 2021-01-07T20:46:23.08 0.6 undecidable manual S 205 91.242 54 -0.13 44
MN.TUE.HHZ. 2021-01-07T20:46:23.27 0.3 undecidable manual P 16 175.3911 54 1 39
IV.MAGA.HHZ. 2021-01-07T20:46:22.09 0.3 undecidable manual P 58 173.9925 54 0.01 53
IV.PLMA.HHZ. 2021-01-07T20:46:20.48 0.3 undecidable manual P 138 133.7661 54 3.39 3
CH.FUSIO.HHZ. 2021-01-07T20:46:20.50 0.3 undecidable manual P 358 166.9107 54 -0.71 47
CH.DIX.HHZ. 2021-01-07T20:46:20.35 0.3 undecidable manual P 321 162.0156 54 -0.25 55
IV.QLNO.HHZ. 2021-01-07T20:46:19.53 0.6 undecidable manual S 204 75.8685 54 -0.36 43
IV.ZONE.HHZ. 2021-01-07T20:46:18.40 0.3 undecidable manual P 50 140.748 54 0.44 56
GU.PZZ.HHZ. 2021-01-07T20:46:17.93 0.3 undecidable manual P 249 136.4634 54 0.51 56
GU.STV.HHZ. 2021-01-07T20:46:17.58 0.6 undecidable manual P 235 135.7641 54 0.25 39
IT.GNV.HGE. 2021-01-07T20:46:16.17 0.6 undecidable manual S 164 59.7957 118 -0.2 46
GU.GRAM.HHZ. 2021-01-07T20:46:16.23 0.3 undecidable manual P 115 116.994 54 1.23 44
IV.MDI.HHE. 2021-01-07T20:46:15.02 0.3 undecidable manual P 40 118.992 54 -0.22 61
GU.RNCA.HHZ. 2021-01-07T20:46:15.10 0.6 undecidable manual S 162 55.9995 120 -0.4 45
GU.SATI.HHZ. 2021-01-07T20:46:15.64 0.3 undecidable manual P 327 122.5884 54 -0.05 64
GU.GORR.HHZ. 2021-01-07T20:46:15.36 0.6 undecidable manual S 131 58.3971 118 -0.71 40
GU.RORO.HHZ. 2021-01-07T20:46:14.44 0.3 undecidable manual P 210 106.8153 54 0.71 55
CH.MUGIO.HHZ. 2021-01-07T20:46:13.99 0.1 undecidable manual P 13 110.4006 54 -0.19 84
GU.CIRO.HHZ. 2021-01-07T20:46:13.54 0.1 undecidable manual P 309 115.8951 54 -1.33 55
GU.CANO.HHZ. 2021-01-07T20:46:12.07 0.1 undecidable manual P 205 91.242 54 0.28 86
GU.TRAV.HHZ. 2021-01-07T20:46:11.76 0.3 undecidable manual P 309 98.9232 54 -0.99 50
IT.ACQ.HGZ. 2021-01-07T20:46:10.75 0.3 undecidable manual S 215 36.4413 132 -0.5 69
IV.SARZ.HHZ. 2021-01-07T20:46:09.32 0.6 undecidable manual S 123 17.1717 153 1.23 33
IV.QLNO.HHZ. 2021-01-07T20:46:09.92 0.1 positive manual P 204 75.8685 54 0.04 93
GU.GORR.HHZ. 2021-01-07T20:46:07.23 0.1 undecidable manual P 131 58.3971 118 -0.44 88
IV.BOB.HNE. 2021-01-07T20:46:07.63 0.3 undecidable manual P 110 59.9955 118 -0.24 69
IT.GNV.HGE. 2021-01-07T20:46:07.71 0.3 undecidable manual P 164 59.7957 118 -0.14 70
GU.RNCA.HHZ. 2021-01-07T20:46:07.01 0.1 undecidable manual P 162 55.9995 120 -0.33 91
GU.ROTM.HHZ. 2021-01-07T20:46:04.85 0.1 positive manual P 249 31.746 136 0.48 89
IT.ACQ.HGZ. 2021-01-07T20:46:04.79 0.1 undecidable manual P 215 36.4413 132 -0.1 100
IV.SARZ.HHZ. 2021-01-07T20:46:03.43 0.1 negative manual P 123 17.1717 153 0.37 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SARZ.HHE. ML:2.1 0.0004149329 0.96 AML other m 2021-01-07T20:46:09.96
IV.SARZ.HHN. ML:2.2 0.0005241095 0.2304 AML other m 2021-01-07T20:46:09.82
IV.SARZ.HNN. ML:2.2 0.0005744559000000001 0.2048 AML other m 2021-01-07T20:46:09.84
IV.SARZ.HNE. ML:2.2 0.0005320296 0.5376 AML other m 2021-01-07T20:46:09.96
GU.RNCA.HHN. ML:1.8 0.000099319805 0.2688 AML other m 2021-01-07T20:46:15.34
GU.RNCA.HHE. ML:2.0 0.000177 0.2 AML other m 2021-01-07T20:46:15.56
GU.GORR.HHN. ML:2.7 0.000892501 0.3584 AML other m 2021-01-07T20:46:16.03
GU.GORR.HHE. ML:2.5 0.00064439285 0.2304 AML other m 2021-01-07T20:46:16.26
GU.ROTM.HHE. ML:2.3 0.0005585 0.76 AML other m 2021-01-07T20:46:16.58
IV.QLNO.HHN. ML:1.7 0.00006623377999999999 0.2816 AML other m 2021-01-07T20:46:19.93
IV.QLNO.HHE. ML:1.9 0.000096463435 0.4608 AML other m 2021-01-07T20:46:19.72
GU.CANO.HHN. ML:2.4 0.00026303359999999996 0.8704 AML other m 2021-01-07T20:46:23.44
GU.CANO.HHE. ML:2.4 0.0002762581 0.4224 AML other m 2021-01-07T20:46:23.81
GU.TRAV.HHE. ML:2.1 0.00010258241500000001 0.2432 AML other m 2021-01-07T20:46:25.11
GU.TRAV.HHN. ML:2.2 0.0001362865 0.0768 AML other m 2021-01-07T20:46:25.56
CH.MUGIO.HHE. ML:1.6 0.000032321860000000004 0.5888 AML other m 2021-01-07T20:46:27.14
GU.RORO.HHN. ML:2.0 0.000081971745 0.3968 AML other m 2021-01-07T20:46:27.37
CH.MUGIO.HHN. ML:1.6 0.0000346 0.46 AML other m 2021-01-07T20:46:27.65
IV.MAGA.HHE. ML:2.2 0.00006657061 0.2688 AML other m 2021-01-07T20:46:42.18
ST.RONC.EHN. ML:2.5 0.00010024657 0.3584 AML other m 2021-01-07T20:46:44.33
ST.RONC.EHE. ML:2.3 0.00006871076 0.5376 AML other m 2021-01-07T20:46:44.52
SI.LUSI.HHN. ML:2.6 0.0001183011 0.2048 AML other m 2021-01-07T20:46:48.97
SI.LUSI.HHE. ML:2.5 0.00008351473000000001 0.1408 AML other m 2021-01-07T20:46:49.21
ST.GAGG.HHE. ML:1.9 0.000021399620000000002 0.8576 AML other m 2021-01-07T20:46:49.75
ST.GAGG.HHN. ML:2.1 0.00003413251 0.2688 AML other m 2021-01-07T20:46:50.10
ST.DOSS.HHE. ML:2.2 0.00003269827 0.1024 AML other m 2021-01-07T20:46:51.46
IV.STAL.HHE. ML:2.2 0.000015636675 0.2432 AML other m 2021-01-07T20:47:17.89
IV.STAL.HHN. ML:2.5 0.00003205 0.18 AML other m 2021-01-07T20:47:18.27
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