Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 18-05-2022 and time 20:55:55 (Italy) in region 4 km SE Impruneta (FI)

A magnitude ML 0.7 earthquake occured in region: 4 km SE Impruneta (FI), on

  • 18-05-2022 18:55:55 (UTC)
  • 18-05-2022 20:55:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6540, 11.2710 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.

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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 7 17062 31677
Greve in Chianti FI 9 13862 45539
Bagno a Ripoli FI 12 25611 71150
Tavarnelle Val di Pesa FI 13 7800 78950
Firenze FI 13 382808 461758
Scandicci FI 14 50609 512367
Figline e Incisa Valdarno FI 15 23505 535872
Barberino Val d'Elsa FI 15 4386 540258
Montespertoli FI 16 13537 553795
Rignano sull'Arno FI 17 8651 562446
Fiesole FI 17 13969 576415
Lastra a Signa FI 19 20156 596571
Pontassieve FI 19 20603 617174
Signa FI 20 19179 636353

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km S of Firenze (382808 inhabitants)
14 Km SE of Scandicci (50609 inhabitants)
29 Km SE of Prato (191150 inhabitants)
38 Km N of Siena (53903 inhabitants)
42 Km SE of Pistoia (90315 inhabitants)
54 Km W of Arezzo (99543 inhabitants)
65 Km E of Lucca (89046 inhabitants)
70 Km E of Pisa (89158 inhabitants)
78 Km E of Livorno (159219 inhabitants)
85 Km E of Viareggio (62467 inhabitants)
86 Km SW of Imola (69797 inhabitants)
86 Km SW of Faenza (58541 inhabitants)
89 Km SW of Forlì (117913 inhabitants)
94 Km S of Bologna (386663 inhabitants)
95 Km SW of Cesena (96758 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
Reviewed
Rev100 		ML 0.7 2022-05-18
18:55:55		 43.6535 11.2707 8 2022-05-18
19:03:57		 Sala Sismica INGV-Roma 104832151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-05-18 18:55:55 ± 0.15
Latitude 43.6535 ± 0.0036
Longitude 11.2707 ± 0.0062
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 104832151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 520
Semi-minor axis of confidence ellipse (meter) 16
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.01439
Epicentral distance of station farthest from the epicenter (degree) 0.25361
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 104832151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-05-18 19:03:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2022-05-18T18:56:05.72 0.6 undecidable manual S 43 28.0497 106 -0.17 47
IV.CRMI.HHZ. 2022-05-18T18:56:05.43 0.6 undecidable manual S 304 28.1496 106 -0.51 44
IV.CSNT.HHZ. 2022-05-18T18:56:03.08 0.6 undecidable manual S 176 20.0688 112 -0.2 48
ZH.T1646.EHZ. 2022-05-18T18:56:01.50 0.6 undecidable manual S 273 12.9759 122 0.41 46
ZH.T1618.EHZ. 2022-05-18T18:56:01.20 0.6 undecidable manual S 235 12.4764 123 0.27 48
IV.CRMI.HHZ. 2022-05-18T18:56:01.26 1.0 undecidable manual P 304 28.1496 106 -0.38 23
IV.OSSC.HHZ. 2022-05-18T18:56:01.17 0.6 undecidable manual S 188 14.5743 119 -0.38 46
IV.RUFI.EHZ. 2022-05-18T18:56:01.72 0.3 positive manual P 43 28.0497 106 0.1 72
ZH.T1647.EHZ. 2022-05-18T18:55:59.39 0.6 undecidable manual S 147 6.1938 143 0.1 50
IV.OSSC.HHZ. 2022-05-18T18:55:59.11 0.1 positive manual P 188 14.5743 119 0 100
IV.FIR.HNZ. 2022-05-18T18:55:59.47 0.3 undecidable manual P 355 13.4754 121 0.55 66
IV.CSNT.HHZ. 2022-05-18T18:55:59.93 0.3 positive manual P 176 20.0688 112 -0.18 72
ZH.T1614.EHZ. 2022-05-18T18:55:59.22 0.6 undecidable manual S 333 7.3815 137 -0.36 47
ZH.T1646.EHZ. 2022-05-18T18:55:58.98 1.0 positive manual P 273 12.9759 122 0.13 24
ZH.T1618.EHZ. 2022-05-18T18:55:58.87 0.1 undecidable manual P 235 12.4764 123 0.11 98
ZH.T1647.EHZ. 2022-05-18T18:55:58.00 0.1 undecidable manual P 147 6.1938 143 0.19 98
ZH.T1648.EHZ. 2022-05-18T18:55:58.59 0.6 undecidable manual S 35 1.5984 169 -0.04 51
ZH.T1648.EHZ. 2022-05-18T18:55:57.38 0.6 undecidable manual P 35 1.5984 169 -0.04 51
ZH.T1614.EHZ. 2022-05-18T18:55:57.84 0.1 undecidable manual P 333 7.3815 137 -0.13 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.OSSC.HHN. ML:0.8 0.00006025 0.46 AML other m 2022-05-18T18:56:02.12
ZH.T1646.EHE. ML:1.2 0.00016949999999999997 0.42 AML other m 2022-05-18T18:56:02.12
IV.OSSC.HHE. ML:1.0 0.0001064 0.84 AML other m 2022-05-18T18:56:02.76
ZH.T1646.EHN. ML:1.1 0.00015200000000000004 0.48 AML other m 2022-05-18T18:56:04.72
IV.CSNT.HHE. ML:0.8 0.00004745 1.74 AML other m 2022-05-18T18:56:05.95
IV.CSNT.HHN. ML:0.7 0.00003925 0.34 AML other m 2022-05-18T18:56:05.78
ZH.T1648.EHE. ML:0.0 0.00132401935 0.1024 AML other m 2022-05-18T18:55:58.69
ZH.T1648.EHN. ML:0.0 0.0007992369499999999 0.0512 AML other m 2022-05-18T18:55:58.67
IV.CRMI.HHE. ML:0.3 0.000007723066000000001 0.2176 AML other m 2022-05-18T18:56:05.93
IV.CRMI.HHN. ML:0.3 0.000012218869000000001 0.2304 AML other m 2022-05-18T18:56:06.93
IV.RUFI.EHE. ML:0.3 0.000011701709999999999 0.1792 AML other m 2022-05-18T18:56:06.22
IV.RUFI.EHN. ML:0.4 0.0000146374215 0.2176 AML other m 2022-05-18T18:56:06.76
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