Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 11-05-2023 and time 22:46:28 (UTC) in region 2 km S Compiano (PR)

A magnitude ML 1.4 earthquake occured in region: 2 km S Compiano (PR), on

  • 11-05-2023 22:46:28 (UTC)
  • 12-05-2023 00:46:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4750, 9.6680 at 5 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.

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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
Compiano PR 3 1112 1112
Tornolo PR 4 1010 2122
Albareto PR 4 2156 4278
Bedonia PR 4 3482 7760
Borgo Val di Taro PR 8 6999 14759
Varese Ligure SP 12 2059 16818
Zeri MS 16 1094 17912
Bardi PR 18 2227 20139
Maissana SP 19 616 20755
Santo Stefano d'Aveto GE 19 1126 21881
Sesta Godano SP 20 1377 23258

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of La Spezia (93959 inhabitants)
56 Km NW of Carrara (63133 inhabitants)
59 Km E of Genova (586655 inhabitants)
62 Km NW of Massa (69479 inhabitants)
64 Km SW of Parma (192836 inhabitants)
64 Km S of Piacenza (102191 inhabitants)
79 Km SW of Cremona (71901 inhabitants)
80 Km W of Reggio nell'Emilia (171345 inhabitants)
82 Km NW of Viareggio (62467 inhabitants)
89 Km SE of Pavia (72576 inhabitants)
96 Km E of Savona (61345 inhabitants)
96 Km SE of Alessandria (93943 inhabitants)
97 Km NW of Lucca (89046 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
Reviewed
Rev100 		ML 1.4 2023-05-11
22:46:28		 44.4748 9.6677 5 2023-05-11
23:13:56		 Sala Sismica INGV-Roma 117265061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-05-11 22:46:28 ± 0.14
Latitude 44.4748 ± 0.0081
Longitude 9.6677 ± 0.0076
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 117265061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 686
Semi-minor axis of confidence ellipse (meter) 615
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 17
Circular confidence region, given by single value of horizontal uncertainty (meter) 690.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 16
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.80220
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 117265061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-05-11 23:13:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2023-05-11T22:47:52.63 3.0 undecidable manual Sn 0.63 0
IV.GIUL.HHZ. 2023-05-11T22:47:42.11 3.0 positive manual Pg 12.06 0
SI.BOSI.HHZ. 2023-05-11T22:47:37.22 3.0 undecidable manual Sn -0.74 0
IV.CPGN.EHZ. 2023-05-11T22:47:35.69 3.0 undecidable manual Sg 4.3 0
GU.PCP.HHE. 2023-05-11T22:46:55.39 0.6 undecidable manual S 275 89.0442 50 -0.33 43
GU.SARM.EHE. 2023-05-11T22:46:49.58 0.6 undecidable manual S 119 66.4779 50 -0.13 47
GU.RNCA.HHZ. 2023-05-11T22:46:46.57 0.6 undecidable manual S 270 56.6988 50 -0.51 44
GU.EQUI.HHE. 2023-05-11T22:46:45.05 0.6 undecidable manual S 131 51.6039 50 -0.66 42
IV.PLMA.HHZ. 2023-05-11T22:46:45.01 0.6 undecidable manual S 163 49.4172 50 -0.13 48
4P.IT07A.HHZ. 2023-05-11T22:46:44.48 0.6 undecidable manual S 17 46.2204 50 0.19 48
GU.PCP.HHE. 2023-05-11T22:46:44.75 0.3 undecidable manual P 275 89.0442 50 0.68 58
GU.SARM.EHE. 2023-05-11T22:46:40.76 0.3 undecidable manual P 119 66.4779 50 0.16 70
GU.GORR.HHZ. 2023-05-11T22:46:39.45 0.6 undecidable manual S 296 33.0447 99 -0.31 48
GU.RNCA.HHZ. 2023-05-11T22:46:39.37 0.3 undecidable manual P 270 56.6988 50 0.28 69
GU.GRAM.HHZ. 2023-05-11T22:46:38.83 0.6 undecidable manual S 87 31.5462 99 -0.4 47
IV.PLMA.HHZ. 2023-05-11T22:46:38.51 0.3 undecidable manual P 163 49.4172 50 0.55 66
GU.EQUI.HHE. 2023-05-11T22:46:38.24 0.3 undecidable manual P 131 51.6039 50 -0.05 74
4P.IT07A.HHZ. 2023-05-11T22:46:37.45 0.1 positive manual P 17 46.2204 50 -0.02 100
GU.GRAM.HHZ. 2023-05-11T22:46:34.68 0.1 undecidable manual P 87 31.5462 99 0.13 100
GU.GORR.HHZ. 2023-05-11T22:46:34.72 0.1 undecidable manual P 296 33.0447 99 -0.14 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GORR.HHE. ML:1.3 0.0000969 0.22 AML other m 2023-05-11T22:46:39.73
GU.GORR.HHN. ML:1.4 0.00010145 0.38 AML other m 2023-05-11T22:46:39.83
GU.GRAM.HHE. ML:1.6 0.0001705 0.28 AML other m 2023-05-11T22:46:40.78
GU.GRAM.HHN. ML:1.4 0.0001075 1.6 AML other m 2023-05-11T22:46:40.98
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