Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 25-08-2023 and time 22:49:36 (Italy) in region 4 km SW Empoli (FI)

A magnitude ML 2.0 earthquake occured in region: 4 km SW Empoli (FI), on

  • 25-08-2023 20:49:36 (UTC)
  • 25-08-2023 22:49:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6960, 10.9120 at 7 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
Empoli FI 4 48109 48109
San Miniato PI 5 27934 76043
Capraia e Limite FI 7 7670 83713
Cerreto Guidi FI 8 10870 94583
Fucecchio FI 9 23618 118201
Montelupo Fiorentino FI 10 14098 132299
Vinci FI 10 14604 146903
Santa Croce sull'Arno PI 11 14601 161504
Castelfiorentino FI 11 17504 179008
Montopoli in Val d'Arno PI 12 11148 190156
Castelfranco di Sotto PI 13 13427 203583
Lamporecchio PT 14 7508 211091
Montespertoli FI 15 13537 224628
Larciano PT 15 6394 231022
Palaia PI 15 4612 235634
Carmignano PO 16 14450 250084
Montaione FI 16 3700 253784
Santa Maria a Monte PI 18 13253 267037
Gambassi Terme FI 18 4870 271907
Poggio a Caiano PO 18 10007 281914
Lastra a Signa FI 18 20156 302070
Quarrata PT 18 26190 328260
Signa FI 18 19179 347439
Certaldo FI 20 16121 363560

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km W of Scandicci (50609 inhabitants)
26 Km SW of Prato (191150 inhabitants)
27 Km S of Pistoia (90315 inhabitants)
29 Km W of Firenze (382808 inhabitants)
37 Km E of Lucca (89046 inhabitants)
41 Km E of Pisa (89158 inhabitants)
51 Km E of Livorno (159219 inhabitants)
54 Km NW of Siena (53903 inhabitants)
56 Km E of Viareggio (62467 inhabitants)
72 Km SE of Massa (69479 inhabitants)
78 Km SE of Carrara (63133 inhabitants)
82 Km W of Arezzo (99543 inhabitants)
95 Km SW of Bologna (386663 inhabitants)
97 Km SW of Imola (69797 inhabitants)
98 Km E of La Spezia (93959 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 2.0 2023-08-25
20:49:36		 43.6962 10.9117 7 2023-08-25
20:57:57		 Sala Sismica INGV-Roma 120475771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-25 20:49:36 ± 0.07
Latitude 43.6962 ± 0.0036
Longitude 10.9117 ± 0.0050
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 120475771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 380
Semi-minor axis of confidence ellipse (meter) 168
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.59805
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 19
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 40
Type of magnitude ML
Reference to an origin 120475771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-25 20:57:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
SI.ABSI.HHZ. 2023-08-25T20:50:27.11 3.0 positive manual Pn 0.98 0
IV.FREG.EHZ. 2023-08-25T20:50:19.18 3.0 negative manual Pn 0.28 0
IV.ROVR.HHZ. 2023-08-25T20:50:10.94 3.0 undecidable manual Pn -0.21 0
GU.GORR.HHZ. 2023-08-25T20:50:04.96 3.0 positive manual P 0.16 0
IV.SFI.EHZ. 2023-08-25T20:50:01.34 3.0 undecidable manual S -2.49 0
GU.GRAM.HHZ. 2023-08-25T20:49:58.34 3.0 positive manual P 0.78 0
IV.TRIF.CHZ. 2023-08-25T20:49:57.06 0.6 undecidable manual S 181 64.491 50 0.08 47
IV.ARCI.HHZ. 2023-08-25T20:49:56.62 3.0 positive manual P -0.07 0
IV.RINC.EHZ. 2023-08-25T20:49:56.20 0.6 undecidable manual S 69 59.5959 50 0.54 43
IV.VMGN.HHZ. 2023-08-25T20:49:55.43 0.6 undecidable manual S 60 57.3981 50 0.35 45
IV.CASP.HHZ. 2023-08-25T20:49:55.65 3.0 undecidable manual P -0.51 0
IV.PLMA.HHZ. 2023-08-25T20:49:54.50 3.0 undecidable manual P -0.27 0
IV.RIBO.EHZ. 2023-08-25T20:49:54.92 3.0 negative manual P 1.6 0
IV.FROS.CHE. 2023-08-25T20:49:54.69 0.6 undecidable manual S 160 57.3981 50 -0.41 44
IV.RUFI.EHZ. 2023-08-25T20:49:53.06 0.6 undecidable manual S 72 50.4162 50 -0.16 47
IV.CAFI.HHZ. 2023-08-25T20:49:53.24 3.0 negative manual P -1.62 0
IV.BOSL.HHZ. 2023-08-25T20:49:51.50 0.6 undecidable manual S 55 45.3213 50 -0.35 46
IV.SFI.EHZ. 2023-08-25T20:49:51.34 3.0 negative manual P -0.7 0
IV.MOCL.EHZ. 2023-08-25T20:49:50.79 0.6 undecidable manual S 32 40.4262 50 0.22 48
GU.POPM.HHZ. 2023-08-25T20:49:50.85 0.6 undecidable manual S 342 40.626 50 0.24 48
GU.MAIM.HHZ. 2023-08-25T20:49:49.97 0.6 undecidable manual S 306 41.3253 50 -0.83 39
GU.GSCL.HHZ. 2023-08-25T20:49:48.60 3.0 undecidable manual P -3.2 0
IV.PSL.EHZ. 2023-08-25T20:49:48.80 0.6 undecidable manual S 2 34.743 102 -0.02 50
MN.VLC.HHZ. 2023-08-25T20:49:48.99 0.1 undecidable manual P 321 66.378 50 0.38 88
IV.OSSC.HHE. 2023-08-25T20:49:48.02 0.6 undecidable manual S 125 32.9448 103 -0.21 49
IV.TRIF.CHZ. 2023-08-25T20:49:48.88 0.1 undecidable manual P 181 64.491 50 0.56 84
IV.FROS.CHE. 2023-08-25T20:49:47.27 0.1 undecidable manual P 160 57.3981 50 0.03 96
IV.MPPT.EHZ. 2023-08-25T20:49:47.95 0.6 undecidable manual S 26 32.3454 103 -0.06 50
IV.VMGN.HHZ. 2023-08-25T20:49:47.24 0.1 undecidable manual P 60 57.3981 50 0.01 97
IV.PII.HHZ. 2023-08-25T20:49:47.36 0.6 undecidable manual S 275 31.1466 103 -0.25 48
IV.RINC.EHZ. 2023-08-25T20:49:47.64 0.1 undecidable manual P 69 59.5959 50 0.08 95
IV.LOCA.HHZ. 2023-08-25T20:49:46.46 0.1 undecidable manual P 147 51.6039 50 0.12 96
IV.RUFI.EHZ. 2023-08-25T20:49:46.20 0.1 undecidable manual P 72 50.4162 50 0.05 97
IV.SEI.HHZ. 2023-08-25T20:49:46.57 0.6 positive manual P 42 53.4021 50 -0.05 48
IV.BOSL.HHZ. 2023-08-25T20:49:45.07 0.1 undecidable manual P 55 45.3213 50 -0.29 93
GU.CARD.HHZ. 2023-08-25T20:49:45.91 0.1 undecidable manual P 317 50.2164 50 -0.22 94
IV.MOCL.EHZ. 2023-08-25T20:49:44.29 0.6 positive manual P 32 40.4262 50 -0.33 47
GU.POPM.HHZ. 2023-08-25T20:49:44.72 0.6 negative manual P 342 40.626 50 0.07 49
GU.MAIM.HHZ. 2023-08-25T20:49:44.72 0.1 undecidable manual P 306 41.3253 50 -0.04 99
IV.OSSC.HHE. 2023-08-25T20:49:43.10 0.1 undecidable manual P 125 32.9448 103 -0.17 98
IV.PII.HHZ. 2023-08-25T20:49:43.11 0.1 negative manual P 275 31.1466 103 0.2 98
IV.CSNT.HHZ. 2023-08-25T20:49:43.87 0.6 negative manual P 129 39.2274 50 -0.56 44
IV.MPPT.EHZ. 2023-08-25T20:49:43.08 0.1 positive manual P 26 32.3454 103 -0.07 100
IV.PSL.EHZ. 2023-08-25T20:49:43.52 0.1 undecidable manual P 2 34.743 102 -0.09 99
IV.CRMI.HHZ. 2023-08-25T20:49:41.43 0.6 undecidable manual S 26 12.2766 121 -0.06 52
IV.CRMI.HHZ. 2023-08-25T20:49:39.70 0.1 undecidable manual P 26 12.2766 121 0.32 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHE. ML:1.6 0.000532 0.3 AML other m 2023-08-25T20:49:42.48
IV.CRMI.HHN. ML:2.0 0.0012 0.12 AML other m 2023-08-25T20:49:42.86
IV.PII.HHE. ML:2.2 0.0007795 0.4 AML other m 2023-08-25T20:49:47.81
IV.MPPT.EHN. ML:2.0 0.00040449999999999997 0.16 AML other m 2023-08-25T20:49:48.85
IV.MPPT.EHE. ML:2.2 0.0008195 0.46 AML other m 2023-08-25T20:49:48.66
IV.PII.HHN. ML:2.2 0.00074 0.62 AML other m 2023-08-25T20:49:49.52
GU.MAIM.HHE. ML:1.8 0.000199 0.36 AML other m 2023-08-25T20:49:50.43
GU.MAIM.HHN. ML:1.8 0.00019800000000000002 0.12 AML other m 2023-08-25T20:49:51.15
GU.POPM.HHN. ML:2.6 0.00135 0.14 AML other m 2023-08-25T20:49:51.45
GU.POPM.HHE. ML:2.5 0.001135 1.06 AML other m 2023-08-25T20:49:51.07
IV.MOCL.EHE. ML:1.9 0.00029549999999999997 0.62 AML other m 2023-08-25T20:49:51.43
IV.BOSL.HHN. ML:2.0 0.0002675 1.5 AML other m 2023-08-25T20:49:51.12
IV.BOSL.HHE. ML:1.8 0.00021 0.9 AML other m 2023-08-25T20:49:52.10
IV.RUFI.EHN. ML:2.0 0.0002605 0.8 AML other m 2023-08-25T20:49:53.57
IV.RUFI.EHE. ML:1.8 0.00016249999999999997 1.3 AML other m 2023-08-25T20:49:53.80
IV.CSNT.HHN. ML:2.2 0.000551 0.52 AML other m 2023-08-25T20:49:54.30
IV.MOCL.EHN. ML:1.8 0.000239 0.2 AML other m 2023-08-25T20:49:55.57
IV.RINC.EHN. ML:2.1 0.0002375 0.64 AML other m 2023-08-25T20:49:56.66
IV.VMGN.HHN. ML:1.8 0.0001575 0.4 AML other m 2023-08-25T20:49:56.50
IV.RINC.EHE. ML:2.1 0.00026250000000000004 0.7 AML other m 2023-08-25T20:49:57.66
IV.SEI.HHE. ML:2.0 0.000226 0.64 AML other m 2023-08-25T20:49:57.71
IV.VMGN.HHE. ML:1.7 0.0001215 1.02 AML other m 2023-08-25T20:49:58.10
GU.CARD.HHN. ML:2.1 0.000333 0.38 AML other m 2023-08-25T20:49:59.19
GU.CARD.HHE. ML:2.0 0.0002855 0.36 AML other m 2023-08-25T20:49:59.23
IV.SEI.HHN. ML:2.3 0.000508 0.38 AML other m 2023-08-25T20:49:59.78
IV.CSNT.HHE. ML:1.9 0.00027600000000000004 0.46 AML other m 2023-08-25T20:49:59.90
MN.VLC.HHN. ML:1.7 0.00009495 0.36 AML other m 2023-08-25T20:50:01.18
IV.SFI.EHN. ML:2.1 0.00018099999999999998 0.46 AML other m 2023-08-25T20:50:02.00
MN.VLC.HHE. ML:1.6 0.00007225000000000001 0.44 AML other m 2023-08-25T20:50:02.28
IV.SFI.EHE. ML:2.0 0.000161 1.4 AML other m 2023-08-25T20:50:02.99
IV.PLMA.HHN. ML:1.9 0.00009125 0.3 AML other m 2023-08-25T20:50:07.26
IV.PLMA.HHE. ML:1.8 0.00007455000000000001 1.4 AML other m 2023-08-25T20:50:08.74
IV.CAFI.HHE. ML:1.5 0.00003655 1.04 AML other m 2023-08-25T20:50:12.14
IV.CAFI.HHN. ML:1.5 0.0000339 0.76 AML other m 2023-08-25T20:50:12.31
GU.GRAM.HHN. ML:2.2 0.000147 1.6 AML other m 2023-08-25T20:50:12.86
GU.GRAM.HHE. ML:2.5 0.00027949999999999996 0.34 AML other m 2023-08-25T20:50:13.35
GU.GORR.HHN. ML:2.1 0.00004825 0.5 AML other m 2023-08-25T20:50:31.47
GU.GORR.HHE. ML:2.0 0.000039 1.22 AML other m 2023-08-25T20:50:31.89
IV.ROVR.HHN. ML:2.1 0.0000343 0.3 AML other m 2023-08-25T20:50:42.27
IV.ROVR.HHE. ML:1.8 0.0000174 0.62 AML other m 2023-08-25T20:51:03.52
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
Waveforms Seismic signals in miniseed + resp format Download