Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 04-05-2022 and time 07:41:18 (UTC) in region 4 km S Impruneta (FI)

A magnitude ML 0.9 earthquake occured in region: 4 km S Impruneta (FI), on

  • 04-05-2022 07:41:18 (UTC)
  • 04-05-2022 09:41:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6520, 11.2540 at 8 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
Impruneta FI 4 14615 14615
San Casciano in Val di Pesa FI 6 17062 31677
Greve in Chianti FI 9 13862 45539
Tavarnelle Val di Pesa FI 12 7800 53339
Bagno a Ripoli FI 12 25611 78950
Firenze FI 13 382808 461758
Scandicci FI 13 50609 512367
Barberino Val d'Elsa FI 14 4386 516753
Montespertoli FI 14 13537 530290
Figline e Incisa Valdarno FI 16 23505 553795
Fiesole FI 18 13969 567764
Lastra a Signa FI 18 20156 587920
Rignano sull'Arno FI 18 8651 596571
Signa FI 19 19179 615750

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km S of Firenze (382808 inhabitants)
13 Km SE of Scandicci (50609 inhabitants)
28 Km SE of Prato (191150 inhabitants)
38 Km N of Siena (53903 inhabitants)
41 Km SE of Pistoia (90315 inhabitants)
55 Km W of Arezzo (99543 inhabitants)
64 Km E of Lucca (89046 inhabitants)
69 Km E of Pisa (89158 inhabitants)
77 Km E of Livorno (159219 inhabitants)
84 Km E of Viareggio (62467 inhabitants)
86 Km SW of Imola (69797 inhabitants)
87 Km SW of Faenza (58541 inhabitants)
90 Km SW of Forlì (117913 inhabitants)
94 Km S of Bologna (386663 inhabitants)
96 Km SW of Cesena (96758 inhabitants)
99 Km E of Massa (69479 inhabitants)
100 Km N of Grosseto (82087 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 0.9 2022-05-04
07:41:18		 43.6523 11.2543 8 2023-01-31
19:03:09		 Bollettino Sismico Italiano INGV 104267191
Reviewed
Rev100 		ML 0.9 2022-05-04
07:41:17		 43.6512 11.2658 9 2022-05-04
07:47:21		 Sala Sismica INGV-Roma 104162431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-05-04 07:41:18 ± 0.06
Latitude 43.6523 ± 0.0027
Longitude 11.2543 ± 0.0062
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 104267191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 473
Semi-minor axis of confidence ellipse (meter) 318
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 259
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40829
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 104267191
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-08-31 09:49:16

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 104162431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-05-04 07:47:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PE3.EHZ. 2022-05-04T07:41:34.07 3.0 negative manual P 0.01 0
IV.SEI.HHZ. 2022-05-04T07:41:33.63 0.6 undecidable manual S 11 45.3213 50 0.43 44
IV.MOCL.EHZ. 2022-05-04T07:41:31.48 0.6 undecidable manual S 351 39.5271 50 -0.17 47
IV.MPPT.EHZ. 2022-05-04T07:41:30.38 0.3 undecidable manual S 339 36.3414 50 -0.41 68
IV.ZCCA.HHZ. 2022-05-04T07:41:30.84 3.0 undecidable manual P -1.09 0
IV.BOSL.HHZ. 2022-05-04T07:41:29.40 0.3 undecidable manual S 17 32.3454 104 -0.19 72
IV.RUFI.EHZ. 2022-05-04T07:41:28.42 0.6 undecidable manual S 45 29.0487 106 -0.05 50
IV.CRMI.HHZ. 2022-05-04T07:41:27.94 0.3 undecidable manual S 306 27.1506 107 0.09 74
IV.SEI.HHZ. 2022-05-04T07:41:27.12 0.3 undecidable manual P 11 45.3213 50 0.34 68
IV.MPPT.EHZ. 2022-05-04T07:41:25.29 0.3 undecidable manual P 339 36.3414 50 -0.1 73
IV.MOCL.EHZ. 2022-05-04T07:41:25.97 0.3 undecidable manual P 351 39.5271 50 0.09 72
IV.CSNT.HHZ. 2022-05-04T07:41:25.20 0.3 undecidable manual S 172 20.0688 112 -0.34 71
IV.RUFI.EHZ. 2022-05-04T07:41:24.09 0.1 undecidable manual P 45 29.0487 106 0.04 99
IV.BOSL.HHZ. 2022-05-04T07:41:24.71 0.1 undecidable manual P 17 32.3454 104 0.02 99
IV.OSSC.HHZ. 2022-05-04T07:41:23.81 0.3 undecidable manual S 183 14.2746 120 0.08 76
IV.CRMI.HHZ. 2022-05-04T07:41:23.71 0.1 undecidable manual P 306 27.1506 107 0.02 100
IV.CSNT.HHZ. 2022-05-04T07:41:22.32 0.3 undecidable manual P 172 20.0688 112 -0.03 76
IV.OSSC.HHZ. 2022-05-04T07:41:21.48 0.1 undecidable manual P 183 14.2746 120 0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.OSSC.HHE. ML:1.5 0.000317 0.12 AML other m 2022-05-04T07:41:24.11
IV.OSSC.HHN. ML:1.2 0.00016350000000000002 0.94 AML other m 2022-05-04T07:41:24.23
IV.CSNT.HHN. ML:0.9 0.000056999999999999996 1.22 AML other m 2022-05-04T07:41:26.24
IV.CSNT.HHE. ML:1.0 0.00007335 0.74 AML other m 2022-05-04T07:41:27.80
IV.CRMI.HHE. ML:0.4 0.0000131 0.6 AML other m 2022-05-04T07:41:29.71
IV.BOSL.HHN. ML:0.5 0.00001745 1.06 AML other m 2022-05-04T07:41:29.07
IV.CRMI.HHN. ML:0.7 0.00002665 1.08 AML other m 2022-05-04T07:41:29.12
IV.BOSL.HHE. ML:0.8 0.00002855 0.18 AML other m 2022-05-04T07:41:29.69
IV.MPPT.EHE. ML:1.1 0.0000486 1.3 AML other m 2022-05-04T07:41:30.18
IV.MPPT.EHN. ML:0.9 0.000032 0.7 AML other m 2022-05-04T07:41:31.19
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