Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 25-08-2023 and time 20:49:36 (UTC) 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) 43.6970, 10.9160 at 7 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
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 9 14098 132299
Vinci FI 10 14604 146903
Castelfiorentino FI 11 17504 164407
Santa Croce sull'Arno PI 11 14601 179008
Montopoli in Val d'Arno PI 13 11148 190156
Lamporecchio PT 14 7508 197664
Castelfranco di Sotto PI 14 13427 211091
Montespertoli FI 14 13537 224628
Larciano PT 15 6394 231022
Palaia PI 15 4612 235634
Carmignano PO 16 14450 250084
Montaione FI 16 3700 253784
Lastra a Signa FI 17 20156 273940
Signa FI 18 19179 293119
Poggio a Caiano PO 18 10007 303126
Quarrata PT 18 26190 329316
Gambassi Terme FI 18 4870 334186
Santa Maria a Monte PI 18 13253 347439
Certaldo FI 19 16121 363560

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km W of Scandicci (50609 inhabitants)
25 Km SW of Prato (191150 inhabitants)
26 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)
57 Km E of Viareggio (62467 inhabitants)
73 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
Bulletin
Rev1000 		ML 2.0 2023-08-25
20:49:36		 43.6972 10.9162 7 2024-09-10
16:44:18		 Bollettino Sismico Italiano INGV 121071441
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 ± 0.08
Latitude 43.6972 ± 0.0036
Longitude 10.9162 ± 0.0050
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 121071441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 389
Semi-minor axis of confidence ellipse (meter) 183
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 60
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 42
Number of defining phases 42
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.10882
Epicentral distance of station farthest from the epicenter (degree) 1.47759
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 40
Type of magnitude ML
Reference to an origin 121071441
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-09-03 10:20:34

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
GU.GORR.HHZ. 2023-08-25T20:50:04.00 0.3 undecidable manual P 309 164.0136 50 0.24 54
IV.SFI.EHZ. 2023-08-25T20:50:00.74 0.3 undecidable manual S 73 77.9664 50 0.04 69
IV.TRIF.CHZ. 2023-08-25T20:49:57.23 0.3 undecidable manual S 181 64.5909 50 0.09 70
IV.FROS.CHE. 2023-08-25T20:49:55.14 0.3 undecidable manual S 160 57.3981 50 -0.08 71
IV.RINC.EHZ. 2023-08-25T20:49:55.98 0.3 undecidable manual S 69 59.1963 50 0.29 68
IV.VMGN.HHZ. 2023-08-25T20:49:55.41 0.3 undecidable manual S 60 56.9985 50 0.3 68
IV.CASP.HHE. 2023-08-25T20:49:55.39 0.3 undecidable manual P 182 100.6215 50 1.39 40
IV.SEI.HHZ. 2023-08-25T20:49:54.61 0.3 undecidable manual S 42 53.1024 50 0.55 65
IV.PLMA.HHZ. 2023-08-25T20:49:53.40 0.3 undecidable manual P 295 93.5397 50 0.5 61
IV.CAFI.HHZ. 2023-08-25T20:49:52.97 0.1 undecidable manual P 115 93.8394 50 0.02 90
IV.RUFI.EHZ. 2023-08-25T20:49:52.60 0.6 undecidable manual S 72 50.0166 50 -0.64 42
IV.BOSL.HHZ. 2023-08-25T20:49:51.43 0.3 undecidable manual S 55 44.9217 50 -0.45 68
IV.SFI.EHZ. 2023-08-25T20:49:50.70 0.3 undecidable manual P 73 77.9664 50 0.2 67
IV.MOCL.EHZ. 2023-08-25T20:49:50.67 0.3 undecidable manual S 32 40.1265 50 0.06 74
GU.POPM.HHZ. 2023-08-25T20:49:50.82 0.3 undecidable manual S 342 40.626 50 0.09 73
GU.MAIM.HHZ. 2023-08-25T20:49:49.95 0.6 undecidable manual S 305 41.625 50 -1.03 36
GU.SARM.EHN. 2023-08-25T20:49:49.11 0.3 undecidable manual P 323 67.8765 50 0.16 69
IV.CSNT.HHZ. 2023-08-25T20:49:49.77 0.6 undecidable manual S 129 39.0276 50 -0.53 45
IV.TRIF.CHZ. 2023-08-25T20:49:48.94 0.3 undecidable manual P 181 64.5909 50 0.49 65
MN.VLC.HHZ. 2023-08-25T20:49:48.99 0.1 undecidable manual P 321 66.4779 50 0.26 90
IV.OSSC.HHE. 2023-08-25T20:49:48.04 0.3 undecidable manual S 126 32.745 102 -0.16 73
IV.PSL.EHZ. 2023-08-25T20:49:48.69 0.3 undecidable manual S 2 34.5432 102 -0.14 73
IV.MPPT.EHZ. 2023-08-25T20:49:48.23 0.3 undecidable manual S 26 32.0457 103 0.25 72
IV.VMGN.HHZ. 2023-08-25T20:49:47.24 0.1 undecidable manual P 60 56.9985 50 -0.03 96
IV.FROS.CHE. 2023-08-25T20:49:47.30 0.1 undecidable manual P 160 57.3981 50 -0.04 96
IV.PII.HHZ. 2023-08-25T20:49:47.30 0.3 undecidable manual S 275 31.4463 103 -0.48 69
IV.RINC.EHZ. 2023-08-25T20:49:47.64 0.1 undecidable manual P 69 59.1963 50 0.04 96
IV.LOCA.HHZ. 2023-08-25T20:49:46.62 0.1 undecidable manual P 147 51.5151 50 0.19 94
IV.RUFI.EHZ. 2023-08-25T20:49:46.20 0.1 undecidable manual P 72 50.0166 50 0.01 98
IV.SEI.HHZ. 2023-08-25T20:49:46.53 0.1 undecidable manual P 42 53.1024 50 -0.14 95
GU.CARD.HHZ. 2023-08-25T20:49:46.13 0.1 undecidable manual P 317 50.4162 50 -0.12 96
IV.BOSL.HHZ. 2023-08-25T20:49:45.07 0.1 undecidable manual P 55 44.9217 50 -0.34 92
GU.MAIM.HHZ. 2023-08-25T20:49:44.72 0.1 undecidable manual P 305 41.625 50 -0.18 96
IV.CSNT.HHZ. 2023-08-25T20:49:44.07 0.1 undecidable manual P 129 39.0276 50 -0.43 91
IV.MOCL.EHZ. 2023-08-25T20:49:44.26 0.1 undecidable manual P 32 40.1265 50 -0.42 91
GU.POPM.HHZ. 2023-08-25T20:49:44.76 0.1 undecidable manual P 342 40.626 50 0.01 99
IV.PSL.EHZ. 2023-08-25T20:49:43.52 0.1 undecidable manual P 2 34.5432 102 -0.12 98
IV.OSSC.HHE. 2023-08-25T20:49:43.10 0.1 undecidable manual P 126 32.745 102 -0.18 97
IV.MPPT.EHZ. 2023-08-25T20:49:43.09 0.1 positive manual P 26 32.0457 103 -0.06 100
IV.PII.HHZ. 2023-08-25T20:49:43.11 0.1 negative manual P 275 31.4463 103 0.07 100
IV.CRMI.HHZ. 2023-08-25T20:49:41.54 0.3 undecidable manual S 25 12.0768 121 0.1 77
IV.CRMI.HHZ. 2023-08-25T20:49:39.70 0.1 positive manual P 25 12.0768 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:1.9 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