Earthquake with magnitude of ML 1.5 on date 21-05-2020 and time 17:17:54 (Italy) in region 4 km E Brallo di Pregola (PV)

A magnitude ML 1.5 earthquake occured in region: 4 km E Brallo di Pregola (PV), on

  • 21-05-2020 15:17:54 (UTC)
  • 21-05-2020 17:17:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.73, 9.33 at 8 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Brallo di Pregola PV 4 599 599
Corte Brugnatella PC 5 586 1185
Cerignale PC 6 127 1312
Bobbio PC 6 3577 4889
Coli PC 7 879 5768
Zerba PC 8 77 5845
Santa Margherita di Staffora PV 8 473 6318
Menconico PV 8 360 6678
Ottone PC 12 516 7194
Romagnese PV 12 687 7881
Fabbrica Curone AL 14 656 8537
Gorreto GE 14 97 8634
Varzi PV 15 3279 11913
Zavattarello PV 16 991 12904
Ferriere PC 16 1294 14198
Valverde PV 17 287 14485
Pecorara PC 17 730 15215
Carrega Ligure AL 17 84 15299
Rovegno GE 17 554 15853
Montacuto AL 18 278 16131
Gremiasco AL 19 324 16455
Cabella Ligure AL 19 528 16983
Bagnaria PV 19 658 17641
Farini PC 19 1290 18931
Nibbiano PC 20 2177 21108
Fascia GE 20 81 21189

Municipalities with at least 50000 inhabitants

An earthquake occurred to
46 Km SW of Piacenza (102191 inhabitants)
47 Km NE of Genova (586655 inhabitants)
52 Km S of Pavia (72576 inhabitants)
60 Km E of Alessandria (93943 inhabitants)
71 Km SW of Cremona (71901 inhabitants)
75 Km SE of Vigevano (63310 inhabitants)
80 Km W of Parma (192836 inhabitants)
80 Km NW of La Spezia (93959 inhabitants)
82 Km NE of Savona (61345 inhabitants)
83 Km S of Milano (1345851 inhabitants)
90 Km S of Sesto San Giovanni (81608 inhabitants)
91 Km E of Asti (76202 inhabitants)
92 Km S of Rho (50434 inhabitants)
93 Km S of Cinisello Balsamo (75078 inhabitants)
95 Km NW of Carrara (63133 inhabitants)
95 Km S of Monza (122671 inhabitants)
97 Km SE of Novara (104380 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 1.5 2020-05-21
15:17:54
44.73 9.33 8 2020-05-21
15:26:50
Sala Sismica INGV-Roma 79413591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-21 15:17:54 ± 0.1
Latitude 44.73 ± 0.00
Longitude 9.33 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 79413591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 542
Semi-minor axis of confidence ellipse (meter) 512
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 339
Circular confidence region, given by single value of horizontal uncertainty (meter) 540
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37232
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 79413591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-21 15:26:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
MN.TIR.HHZ. 2020-05-21T15:20:15.08 3.0 positive manual Pg 25.799999 0
IT.LRNO.HNZ. 2020-05-21T15:20:03.03 3.0 undecidable manual Sn 5.37 0
IV.POFI.HHZ. 2020-05-21T15:19:56.02 3.0 undecidable manual Sg 13.53 0
IV.GIUL.HHZ. 2020-05-21T15:19:43.30 3.0 undecidable manual Sn 3.55 0
IV.MNTT.EHZ. 2020-05-21T15:19:22.05 3.0 undecidable manual Sn 1.41 0
IV.RM33.HNZ. 2020-05-21T15:19:21.59 3.0 undecidable manual Sn -1.11 0
IV.PTRJ.HNZ. 2020-05-21T15:19:19.90 3.0 undecidable manual Pg 16.790001 0
OT.OT05.EHZ. 2020-05-21T15:19:16.53 3.0 negative manual Pn 7.47 0
IV.TRIV.HHZ. 2020-05-21T15:19:12.13 3.0 undecidable manual Pg 12.55 0
IV.PAOL.HHZ. 2020-05-21T15:19:06.06 3.0 undecidable manual Pn -0.56 0
CR.ZAG.BHZ. 2020-05-21T15:19:03.46 3.0 negative manual Pn 2.44 0
IV.RM33.HNZ. 2020-05-21T15:18:46.21 3.0 undecidable manual Pn 3.64 0
IV.TOLF.HHZ. 2020-05-21T15:18:39.48 3.0 undecidable manual Pn 0.58 0
IV.FREG.EHZ. 2020-05-21T15:18:30.20 3.0 negative manual Pn 0.44 0
GU.RNCA.HHZ. 2020-05-21T15:18:08.74 0.3 undecidable manual S 226 0.3723 50 -0.22 68
IV.SARZ.HHE. 2020-05-21T15:18:07.14 0.6 undecidable manual S 295 0.3238 102 -0.29 45
GU.RNCA.HHZ. 2020-05-21T15:18:03.07 0.1 undecidable manual P 226 0.3723 50 0.14 92
IV.SARZ.HHE. 2020-05-21T15:18:02.33 0.3 undecidable manual P 295 0.3238 102 0.28 68
GU.GORR.HHZ. 2020-05-21T15:18:00.14 0.1 undecidable manual S 191 0.1259 118 -0.05 99
IV.BOB.HHZ. 2020-05-21T15:17:59.05 0.1 undecidable manual S 66 0.0935 126 -0.08 99
IV.BOB.HHZ. 2020-05-21T15:17:57.24 0.1 undecidable manual P 66 0.0935 126 -0.01 100
GU.GORR.HHZ. 2020-05-21T15:17:57.95 0.1 positive manual P 191 0.1259 118 0.09 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GORR.HHN. ML:1.6 0.000514 0.18 AML other m 2020-05-21T15:18:00.44
GU.GORR.HHE. ML:1.4 0.000251 0.18 AML other m 2020-05-21T15:18:00.70
GU.RNCA.HHE. ML:0.9 2.525E-5 0.24 AML other m 2020-05-21T15:18:09.74
IV.BOB.HHE. ML:1.7 0.0007783338 0.1664 AML other m 2020-05-21T15:17:59.33
IV.BOB.HHN. ML:1.6 0.00062302615 0.1408 AML other m 2020-05-21T15:17:59.26
IV.BOB.HNE. ML:1.7 0.0007746892 0.1536 AML other m 2020-05-21T15:17:59.33
IV.BOB.HNN. ML:1.6 0.0005513745 0.1408 AML other m 2020-05-21T15:17:59.26
GU.RNCA.HHN. ML:0.6 1.40424745E-5 0.1664 AML other m 2020-05-21T15:18:08.00
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