Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 23-09-2023 and time 14:46:56 (Italy) in region 1 km NW Massa Martana (PG)

A magnitude ML 2.0 earthquake occured in region: 1 km NW Massa Martana (PG), on

  • 23-09-2023 12:46:56 (UTC)
  • 23-09-2023 14:46:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7840, 12.5120 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
Massa Martana PG 1 3770 3770
Giano dell'Umbria PG 8 3846 7616
Todi PG 9 16851 24467
Acquasparta TR 11 4778 29245
Collazzone PG 14 3473 32718
Castel Ritaldi PG 14 3278 35996
Fratta Todina PG 14 1839 37835
Monte Castello di Vibio PG 14 1567 39402
Gualdo Cattaneo PG 15 6155 45557
Montecastrilli TR 15 5022 50579
Avigliano Umbro TR 16 2558 53137
Montefalco PG 17 5679 58816
Bevagna PG 19 5081 63897
San Gemini TR 19 5018 68915
Spoleto PG 19 38218 107133
Marsciano PG 20 18902 126035

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Foligno (57155 inhabitants)
27 Km NW of Terni (111501 inhabitants)
37 Km S of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
97 Km NE of Civitavecchia (52991 inhabitants)
98 Km W of Teramo (54892 inhabitants)
99 Km N of Roma (2864731 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 2023-09-23
12:46:56		 42.7837 12.512 8 2023-09-23
12:59:14		 Sala Sismica INGV-Roma 121394221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-23 12:46:56 ± 0.08
Latitude 42.7837 ± 0.0045
Longitude 12.5120 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121394221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 547
Semi-minor axis of confidence ellipse (meter) 372
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 201
Circular confidence region, given by single value of horizontal uncertainty (meter) 550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 152
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 38
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) 0.72305
Number of stations at which the event was observed 36
Number of stations from which data was used for origin computation 20
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 121394221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-23 12:59:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAR1.HNZ. 2023-09-23T12:48:23.44 3.0 undecidable manual Sn -7 0
GU.RRL.HHZ. 2023-09-23T12:48:12.66 3.0 undecidable manual Pn 10.08 0
GU.STV.HHZ. 2023-09-23T12:48:09.72 3.0 undecidable manual Pg 16.280001 0
GU.TRAV.HHZ. 2023-09-23T12:48:08.64 3.0 positive manual Pn 8.66 0
RF.GEPF.HHZ. 2023-09-23T12:48:05.36 3.0 negative manual Pg 15.95 0
IV.SGRT.HHZ. 2023-09-23T12:47:59.06 3.0 undecidable manual Sg 7.27 0
NI.VINO.HHZ. 2023-09-23T12:47:58.26 3.0 negative manual Pg 9.03 0
IV.CMPR.HHZ. 2023-09-23T12:47:58.32 3.0 undecidable manual Sn -1.61 0
GU.IMI.HHZ. 2023-09-23T12:47:50.19 3.0 undecidable manual Pn 3.84 0
IV.GRI.EHZ. 2023-09-23T12:47:50.75 3.0 positive manual Pn 0.67 0
IV.MOCO.HHZ. 2023-09-23T12:47:50.68 3.0 undecidable manual Sg 6.92 0
IV.CRND.HNZ. 2023-09-23T12:47:48.91 3.0 undecidable manual Pg 5.17 0
IV.ROVR.HNZ. 2023-09-23T12:47:43.50 3.0 undecidable manual Pn 0.17 0
IV.ARRO.EHE. 2023-09-23T12:47:22.08 0.6 undecidable manual S 30.6471 1.462 0
IV.MF5.EHZ. 2023-09-23T12:47:21.61 0.3 undecidable manual S 73 80.2641 50 0.64 57
IV.MCRV.HHZ. 2023-09-23T12:47:20.48 3.0 undecidable manual Pn -1.41 0
IV.SMA1.EHZ. 2023-09-23T12:47:18.75 0.3 undecidable manual S 104 69.1752 50 0.73 56
IV.CSP1.EHZ. 2023-09-23T12:47:17.29 0.3 undecidable manual S 58 65.8896 50 0.17 66
IV.RM33.EHZ. 2023-09-23T12:47:17.36 0.6 undecidable manual S 118 64.8906 50 0.49 41
IV.ATFO.HHZ. 2023-09-23T12:47:17.14 0.6 undecidable manual S 4 64.8906 50 0.29 43
IV.ARRO.EHE. 2023-09-23T12:47:17.77 0.1 undecidable manual P 30.6471 1.497 0
IV.SNTG.HHE. 2023-09-23T12:47:16.49 0.6 undecidable manual S 33 62.7927 50 0.19 44
IV.FDMO.HHZ. 2023-09-23T12:47:14.20 0.6 undecidable manual S 59 54.501 50 0.11 46
IV.MURB.HHZ. 2023-09-23T12:47:14.04 0.6 undecidable manual S 1 53.2023 50 0.3 44
IV.MML1.EHZ. 2023-09-23T12:47:13.43 0.6 undecidable manual S 45 52.3032 50 -0.06 46
IV.LNSS.HHZ. 2023-09-23T12:47:12.06 0.3 undecidable manual S 115 47.5191 50 -0.17 68
IV.NRCA.HHZ. 2023-09-23T12:47:12.63 0.3 undecidable manual S 83 49.3173 50 -0.08 70
IT.MTCL.HGE. 2023-09-23T12:47:11.62 0.6 undecidable manual S 59 46.0206 50 -0.19 46
IV.CESI.HHZ. 2023-09-23T12:47:10.04 0.3 undecidable manual S 52 40.2264 50 -0.25 68
IV.MF5.EHZ. 2023-09-23T12:47:10.49 1.0 undecidable manual P 73 80.2641 50 -0.12 22
IV.MCIV.CHN. 2023-09-23T12:47:09.18 0.1 undecidable manual P 270 67.9764 50 0.47 82
IV.CSP1.EHZ. 2023-09-23T12:47:08.27 0.1 positive manual P 58 65.8896 50 -0.11 89
IV.RM33.EHZ. 2023-09-23T12:47:08.05 0.1 undecidable manual P 118 64.8906 50 -0.18 88
IV.ATFO.HHZ. 2023-09-23T12:47:08.39 0.6 positive manual P 4 64.8906 50 0.17 44
IV.GAVE.HNZ. 2023-09-23T12:47:08.36 0.6 undecidable manual S 108 32.745 104 0.21 46
IV.MGAB.HHZ. 2023-09-23T12:47:08.87 0.3 undecidable manual S 294 35.5422 50 -0.16 70
IV.ATMI.HHZ. 2023-09-23T12:47:08.18 1.0 positive manual P 342 64.1913 50 0.06 23
IV.SMA1.EHZ. 2023-09-23T12:47:08.88 0.1 undecidable manual P 104 69.1752 50 -0.02 90
IV.SNTG.HHE. 2023-09-23T12:47:07.63 0.1 undecidable manual P 33 62.7927 50 -0.28 87
IV.FDMO.HHZ. 2023-09-23T12:47:06.42 0.1 positive manual P 59 54.501 50 -0.21 89
IV.MURB.HHZ. 2023-09-23T12:47:06.64 0.3 undecidable manual P 1 53.2023 50 0.21 67
IV.MML1.EHZ. 2023-09-23T12:47:06.05 0.1 positive manual P 45 52.3032 50 -0.23 89
IV.SACS.HHZ. 2023-09-23T12:47:05.94 3.0 positive manual P 1.1 0
IV.LNSS.HHZ. 2023-09-23T12:47:05.31 0.1 undecidable manual P 115 47.5191 50 -0.24 90
IT.MTCL.HGE. 2023-09-23T12:47:05.19 0.1 undecidable manual P 59 46.0206 50 -0.12 92
IV.NRCA.HHZ. 2023-09-23T12:47:05.59 0.1 positive manual P 83 49.3173 50 -0.24 90
IV.CESI.HHZ. 2023-09-23T12:47:04.12 0.3 undecidable manual P 52 40.2264 50 -0.31 67
IV.MGAB.HHZ. 2023-09-23T12:47:03.53 0.1 positive manual P 294 35.5422 50 -0.17 93
IV.GAVE.HNZ. 2023-09-23T12:47:02.98 0.1 undecidable manual P 108 32.745 104 -0.22 93
IV.MOMA.HHZ. 2023-09-23T12:46:59.72 0.1 undecidable manual S 65 5.1948 147 -0.08 100
IT.GNU.HGZ. 2023-09-23T12:46:59.72 0.3 undecidable manual S 65 5.1948 147 -0.09 75
IV.MOMA.HHZ. 2023-09-23T12:46:58.65 0.1 undecidable manual P 65 5.1948 147 0.27 96
IT.GNU.HGZ. 2023-09-23T12:46:58.68 0.1 negative manual P 65 5.1948 147 0.3 96
IV.RCAV.EHZ. 2023-09-23T12:46:46.29 3.0 negative manual P -4.42 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNE. ML:2.8 0.012 1.68 AML other m 2023-09-23T12:47:00.03
IV.MOMA.HHN. ML:2.7 0.00906 0.2 AML other m 2023-09-23T12:47:00.04
IT.GNU.HGE. ML:4.4 0.4425 0.98 AML other m 2023-09-23T12:47:00.19
IV.MOMA.HHE. ML:2.7 0.009265 0.88 AML other m 2023-09-23T12:47:00.86
IT.GNU.HGN. ML:4.4 0.4305 1 AML other m 2023-09-23T12:47:00.12
IV.MOMA.HNN. ML:2.5 0.005810000000000001 0.54 AML other m 2023-09-23T12:47:00.96
IV.MGAB.HHN. ML:2.2 0.0006535 1.74 AML other m 2023-09-23T12:47:10.02
IV.MGAB.HNN. ML:2.1 0.000578 1.72 AML other m 2023-09-23T12:47:10.89
IV.MGAB.HHE. ML:2.1 0.000547 0.5 AML other m 2023-09-23T12:47:10.00
IV.MGAB.HNE. ML:2.1 0.000571 0.5 AML other m 2023-09-23T12:47:10.01
IV.CESI.HHE. ML:1.8 0.00021700000000000002 0.34 AML other m 2023-09-23T12:47:10.34
IV.CESI.HHN. ML:2.0 0.000345 0.28 AML other m 2023-09-23T12:47:11.64
IV.LNSS.HHN. ML:2.1 0.000373 0.32 AML other m 2023-09-23T12:47:13.74
IV.NRCA.HHE. ML:2.1 0.000315 0.22 AML other m 2023-09-23T12:47:13.98
IV.LNSS.HHE. ML:2.1 0.000366 0.58 AML other m 2023-09-23T12:47:14.14
IV.NRCA.HHN. ML:2.0 0.0002375 1.14 AML other m 2023-09-23T12:47:15.15
IV.FDMO.HHE. ML:1.8 0.00013550000000000001 0.28 AML other m 2023-09-23T12:47:15.15
IV.MML1.HNE. ML:1.9 0.0001975 0.62 AML other m 2023-09-23T12:47:15.56
IV.MML1.EHN. ML:1.7 0.000129 0.18 AML other m 2023-09-23T12:47:15.66
IV.MML1.EHE. ML:1.8 0.0001638 0.62 AML other m 2023-09-23T12:47:15.57
IV.SACS.HHN. ML:1.6 0.0001215 0.66 AML other m 2023-09-23T12:47:16.13
IV.MURB.HHN. ML:2.5 0.000782 0.26 AML other m 2023-09-23T12:47:16.63
IV.MML1.HNN. ML:1.9 0.0001855 1.2 AML other m 2023-09-23T12:47:17.93
IV.RM33.EHE. ML:1.9 0.0001485 0.28 AML other m 2023-09-23T12:47:18.22
IV.CSP1.EHN. ML:2.2 0.00030649999999999997 0.54 AML other m 2023-09-23T12:47:18.42
IV.ATFO.HHE. ML:1.9 0.000156 0.32 AML other m 2023-09-23T12:47:18.48
IV.ATFO.HHN. ML:1.9 0.0001615 1.66 AML other m 2023-09-23T12:47:18.02
IV.MURB.HHE. ML:2.3 0.00048550000000000004 1.7 AML other m 2023-09-23T12:47:18.06
IV.SMA1.EHN. ML:2.1 0.000234 0.4 AML other m 2023-09-23T12:47:19.52
IV.RM33.EHN. ML:1.8 0.0001255 0.68 AML other m 2023-09-23T12:47:19.91
IV.FDMO.HHN. ML:1.8 0.00016549999999999998 0.94 AML other m 2023-09-23T12:47:20.41
IV.ATMI.HHE. ML:2.4 0.000462 0.28 AML other m 2023-09-23T12:47:21.75
IV.SACS.HHE. ML:1.7 0.000123 1.28 AML other m 2023-09-23T12:47:21.29
IV.ATMI.HHN. ML:2.3 0.0003445 0.3 AML other m 2023-09-23T12:47:22.61
IV.CSP1.EHE. ML:2.1 0.0002455 0.42 AML other m 2023-09-23T12:47:23.64
IV.SMA1.EHE. ML:2.1 0.00023150000000000002 1.4 AML other m 2023-09-23T12:47:25.99
IV.ROVR.HNN. ML:4.3 0.0017749999999999999 0.8 AML other m 2023-09-23T12:47:48.07
IV.ROVR.HNE. ML:3.8 0.000622 0.48 AML other m 2023-09-23T12:47:49.30
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