Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 21-02-2021 and time 09:54:20 (Italy) in region 3 km W Torre d'Isola (PV)

A magnitude ML 1.6 earthquake occured in region: 3 km W Torre d'Isola (PV), on

  • 21-02-2021 08:54:20 (UTC)
  • 21-02-2021 09:54:20 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.23, 9.04 at 39 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Torre d'Isola PV 3 2417 2417
Zerbolò PV 3 1752 4169
Bereguardo PV 4 2794 6963
Trivolzio PV 4 2146 9109
Marcignago PV 4 2465 11574
Battuda PV 6 660 12234
Villanova d'Ardenghi PV 6 772 13006
Trovo PV 6 1041 14047
Vellezzo Bellini PV 7 3253 17300
Gropello Cairoli PV 7 4599 21899
Carbonara al Ticino PV 7 1548 23447
Certosa di Pavia PV 7 5452 28899
Borgarello PV 8 2729 31628
Rognano PV 8 649 32277
Motta Visconti MI 8 7849 40126
Casorate Primo PV 10 8709 48835
Garlasco PV 10 9787 58622
Giussago PV 10 5168 63790
Vernate MI 10 3348 67138
Borgo San Siro PV 10 1019 68157
Pavia PV 10 72576 140733
San Martino Siccomario PV 11 6182 146915
Dorno PV 11 4656 151571
San Genesio ed Uniti PV 11 3856 155427
Zinasco PV 11 3262 158689
Cava Manara PV 11 6707 165396
Sommo PV 11 1145 166541
Casarile MI 11 4091 170632
Besate MI 11 2064 172696
Bubbiano MI 12 2411 175107
Calvignasco MI 12 1199 176306
Travacò Siccomario PV 12 4436 180742
Binasco MI 13 7265 188007
Zeccone PV 13 1719 189726
Lacchiarella MI 13 8944 198670
Alagna PV 14 875 199545
Tromello PV 14 3856 203401
Rosate MI 14 5683 209084
Pieve Albignola PV 14 873 209957
Sant'Alessio con Vialone PV 14 957 210914
Gambolò PV 14 10091 221005
Bornasco PV 15 2649 223654
Mezzana Rabattone PV 15 497 224151
Noviglio MI 15 4560 228711
Lardirago PV 15 1210 229921
Rea PV 15 425 230346
Scaldasole PV 15 938 231284
Zibido San Giacomo MI 16 6861 238145
Morimondo MI 16 1140 239285
Bastida Pancarana PV 16 1023 240308
Siziano PV 16 5989 246297
Ceranova PV 16 2154 248451
Valle Salimbene PV 16 1511 249962
Verrua Po PV 16 1272 251234
Valeggio PV 17 217 251451
Gudo Visconti MI 17 1667 253118
Vidigulfo PV 17 6311 259429
Pancarana PV 17 316 259745
Cura Carpignano PV 17 4851 264596
Mezzanino PV 17 1440 266036
Sannazzaro de' Burgondi PV 17 5515 271551
Vigevano PV 18 63310 334861
Basiglio MI 18 7769 342630
Castelletto di Branduzzo PV 18 1033 343663
Roncaro PV 18 1557 345220
Cervesina PV 18 1204 346424
Ozzero MI 18 1495 347919
Bressana Bottarone PV 18 3529 351448
Ottobiano PV 19 1090 352538
Zelo Surrigone MI 19 1771 354309
Pieve Emanuele MI 19 16183 370492
Ferrera Erbognone PV 19 1189 371681
Albuzzano PV 19 3513 375194
Corana PV 19 812 376006
Linarolo PV 19 2821 378827
Rozzano MI 19 42475 421302
Landriano PV 19 6327 427629
Vermezzo MI 20 3920 431549
Casanova Lonati PV 20 458 432007
Marzano PV 20 1699 433706
Gaggiano MI 20 9032 442738

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km W of Pavia (72576 inhabitants)
18 Km SE of Vigevano (63310 inhabitants)
29 Km SW of Milano (1345851 inhabitants)
34 Km S of Rho (50434 inhabitants)
37 Km SW of Sesto San Giovanni (81608 inhabitants)
39 Km SW of Cinisello Balsamo (75078 inhabitants)
41 Km SE of Novara (104380 inhabitants)
42 Km S of Legnano (60262 inhabitants)
44 Km SW of Monza (122671 inhabitants)
46 Km SE of Busto Arsizio (83106 inhabitants)
48 Km NE of Alessandria (93943 inhabitants)
52 Km SE of Gallarate (53343 inhabitants)
55 Km W of Piacenza (102191 inhabitants)
65 Km S of Como (84495 inhabitants)
68 Km S of Varese (80799 inhabitants)
71 Km SW of Bergamo (119381 inhabitants)
75 Km E of Asti (76202 inhabitants)
78 Km W of Cremona (71901 inhabitants)
91 Km N of Genova (586655 inhabitants)
98 Km W of Brescia (196480 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.6 2021-02-21
08:54:20		 45.23 9.04 39 2021-02-21
09:06:56		 Sala Sismica INGV-Roma 87354051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-21 08:54:20 ± 0.07
Latitude 45.23 ± 0.00
Longitude 9.04 ± 0.01
Depth (km) 39 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87354051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 569
Semi-minor axis of confidence ellipse (meter) 491
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) 570
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 30
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.11696
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 87354051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-21 09:06:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARRO.EHZ. 2021-02-21T08:56:13.74 3.0 undecidable manual Sg 9.86 0
IV.ARVD.HHZ. 2021-02-21T08:55:49.73 3.0 undecidable manual Sn -2.54 0
IV.MCIV.CHZ. 2021-02-21T08:55:07.25 3.0 negative manual Pn -1.88 0
IV.BRSN.HNZ. 2021-02-21T08:55:00.95 3.0 positive manual Pn 1.61 0
CH.MMK.HHE. 2021-02-21T08:54:53.98 0.6 undecidable manual S 318 1.117 91 -0.06 45
IV.SGAL.EHZ. 2021-02-21T08:54:50.23 0.6 undecidable manual S 69 0.9506 91 0.16 45
GU.TRAV.HHE. 2021-02-21T08:54:50.31 0.6 undecidable manual S 288 0.9551 91 0.14 46
GU.PCP.HHE. 2021-02-21T08:54:46.16 0.6 undecidable manual S 207 0.7707 91 0.4 45
GU.RNCA.HHE. 2021-02-21T08:54:45.63 0.6 undecidable manual S 185 0.7581 92 0.17 47
CH.MUGIO.HHZ. 2021-02-21T08:54:44.25 0.3 undecidable manual S 360 0.6943 92 0.3 70
IV.MDI.HHZ. 2021-02-21T08:54:44.31 0.3 undecidable manual S 41 0.7186 92 -0.2 71
IV.VARE.HHZ. 2021-02-21T08:54:43.64 0.3 undecidable manual S 343 0.6682 92 0.32 70
GU.GORR.HHE. 2021-02-21T08:54:42.22 0.3 undecidable manual S 164 0.6439 92 -0.51 68
IV.MERA.HNE. 2021-02-21T08:54:40.34 0.3 undecidable manual S 29 0.5495 94 -0.13 75
CH.MMK.HHE. 2021-02-21T08:54:39.33 0.6 undecidable manual P 318 1.117 91 -0.36 42
IV.BOB.HHE. 2021-02-21T08:54:39.70 0.6 undecidable manual S 148 0.5405 94 -0.56 46
GU.CIRO.HHZ. 2021-02-21T08:54:38.92 0.3 undecidable manual P 290 1.1008 91 -0.56 60
IV.MSSA.HHZ. 2021-02-21T08:54:38.08 0.3 undecidable manual P 160 0.9704 91 0.41 64
IV.SGAL.EHZ. 2021-02-21T08:54:37.85 0.3 undecidable manual P 69 0.9506 91 0.45 64
GU.TRAV.HHE. 2021-02-21T08:54:37.20 0.3 undecidable manual P 288 0.9551 91 -0.25 67
GU.RNCA.HHE. 2021-02-21T08:54:35.05 0.3 undecidable manual P 185 0.7581 92 0.31 69
IV.MDI.HHZ. 2021-02-21T08:54:34.09 0.3 undecidable manual P 41 0.7186 92 -0.1 73
GU.PCP.HHE. 2021-02-21T08:54:34.96 0.3 undecidable manual P 207 0.7707 91 0.05 72
IV.VARE.HHZ. 2021-02-21T08:54:33.72 0.3 undecidable manual P 343 0.6682 92 0.22 72
GU.GORR.HHE. 2021-02-21T08:54:33.15 0.3 undecidable manual P 164 0.6439 92 -0.01 75
CH.MUGIO.HHZ. 2021-02-21T08:54:33.70 0.3 undecidable manual P 360 0.6943 92 -0.16 72
IV.EUCT.HNZ. 2021-02-21T08:54:31.86 0.3 undecidable manual S 111 0.0683 165 0.34 80
IV.MERA.HNE. 2021-02-21T08:54:31.73 0.1 undecidable manual P 29 0.5495 94 -0.12 100
IV.BOB.HHE. 2021-02-21T08:54:31.40 0.6 undecidable manual P 148 0.5405 94 -0.33 48
IV.EUCT.HNZ. 2021-02-21T08:54:26.55 0.3 undecidable manual P 111 0.0683 165 -0.14 81
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
CH.MUGIO.HHE. ML:1.6 5.505E-5 0.2 AML other m 2021-02-21T08:54:44.36
CH.MUGIO.HHN. ML:1.6 4.74E-5 0.24 AML other m 2021-02-21T08:54:44.69
IV.MDI.HHN. ML:1.7 5.255E-5 0.12 AML other m 2021-02-21T08:54:45.02
IV.MDI.HHE. ML:1.7 5.59E-5 0.48 AML other m 2021-02-21T08:54:45.31
IV.NDIM.HNE. ML:3.4 0.001285 0.08 AML other m 2021-02-21T08:55:23.73
IV.NDIM.HNN. ML:3.1 0.0005885 0.4 AML other m 2021-02-21T08:55:23.93
IV.EUCT.HNE. ML:2.1 0.00042332165 0.2176 AML other m 2021-02-21T08:54:31.97
IV.EUCT.HNN. ML:2.5 0.00104991495 0.1792 AML other m 2021-02-21T08:54:32.05
IV.VARE.HHE. ML:1.3 2.4561205E-5 0.2176 AML other m 2021-02-21T08:54:44.73
IV.VARE.HHN. ML:1.3 2.61764355E-5 0.1152 AML other m 2021-02-21T08:54:44.62
IV.SGAL.EHE. ML:1.5 2.281633E-5 0.1024 AML other m 2021-02-21T08:54:51.94
IV.SGAL.EHN. ML:1.4 2.0782005E-5 0.1024 AML other m 2021-02-21T08:54:52.72
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download