Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 31-12-2022 and time 01:54:27 (Italy) in region 2 km NW Massa Martana (PG)

A magnitude ML 0.9 earthquake occured in region: 2 km NW Massa Martana (PG), on

  • 31-12-2022 00:54:27 (UTC)
  • 31-12-2022 01:54:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7940, 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 2 3770 3770
Giano dell'Umbria PG 7 3846 7616
Todi PG 9 16851 24467
Acquasparta TR 12 4778 29245
Collazzone PG 13 3473 32718
Gualdo Cattaneo PG 13 6155 38873
Castel Ritaldi PG 14 3278 42151
Fratta Todina PG 14 1839 43990
Monte Castello di Vibio PG 14 1567 45557
Montecastrilli TR 16 5022 50579
Montefalco PG 16 5679 56258
Avigliano Umbro TR 17 2558 58816
Bevagna PG 18 5081 63897
Marsciano PG 19 18902 82799
Spoleto PG 20 38218 121017

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Foligno (57155 inhabitants)
28 Km NW of Terni (111501 inhabitants)
36 Km S of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
88 Km NW of L'Aquila (69753 inhabitants)
90 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km SE of Arezzo (99543 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
98 Km NE of Civitavecchia (52991 inhabitants)
99 Km W of Teramo (54892 inhabitants)
100 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 0.9 2022-12-31
00:54:27		 42.794 12.5123 8 2022-12-31
01:50:20		 Sala Sismica INGV-Roma 113203651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-12-31 00:54:27 ± 0.12
Latitude 42.7940 ± 0.0027
Longitude 12.5123 ± 0.0110
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 113203651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 900
Semi-minor axis of confidence ellipse (meter) 236
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 271
Circular confidence region, given by single value of horizontal uncertainty (meter) 900.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 209
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.04317
Epicentral distance of station farthest from the epicenter (degree) 0.46315
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 113203651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-12-31 01:50:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2022-12-31T00:54:44.76 0.3 undecidable manual S 46 51.4152 50 0.24 68
IV.CESI.HHZ. 2022-12-31T00:54:41.51 0.3 undecidable manual S 54 39.5271 50 0.17 71
IV.ASSB.HHZ. 2022-12-31T00:54:38.48 0.3 undecidable manual S 23 30.0477 105 0.04 74
IV.ARRO.EHZ. 2022-12-31T00:54:38.93 0.3 undecidable manual S 139 31.5462 104 -0.01 74
IV.MML1.EHZ. 2022-12-31T00:54:37.14 0.1 undecidable manual P 46 51.4152 50 -0.25 91
IV.ATCC.EHE. 2022-12-31T00:54:36.31 0.3 undecidable manual P 13 44.622 50 -0.02 72
IV.CESX.HHZ. 2022-12-31T00:54:35.58 0.3 undecidable manual S 164 21.4674 111 -0.02 76
IV.CESI.HHZ. 2022-12-31T00:54:35.35 0.1 undecidable manual P 54 39.5271 50 -0.2 94
IV.ARRO.EHZ. 2022-12-31T00:54:34.05 0.1 undecidable manual P 139 31.5462 104 -0.12 97
IV.ASSB.HHZ. 2022-12-31T00:54:33.80 0.1 undecidable manual P 23 30.0477 105 -0.08 98
IV.CESX.HHZ. 2022-12-31T00:54:32.39 0.1 undecidable manual P 164 21.4674 111 0.15 98
IV.MOMA.HHZ. 2022-12-31T00:54:30.77 0.3 undecidable manual S 77 4.7952 149 -0.13 76
IT.GNU.HGZ. 2022-12-31T00:54:30.77 0.3 undecidable manual S 77 4.7952 149 -0.13 76
IV.MOMA.HHZ. 2022-12-31T00:54:29.72 0.1 undecidable manual P 77 4.7952 149 0.19 100
IT.GNU.HGZ. 2022-12-31T00:54:29.73 0.1 undecidable manual P 77 4.7952 149 0.2 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHE. ML:1.0 0.00007235 1.64 AML other m 2022-12-31T00:54:37.12
IV.CESX.HHN. ML:0.9 0.00005675 0.7 AML other m 2022-12-31T00:54:38.32
IV.ASSB.HHE. ML:0.8 0.000031115990999999994 0.24 AML other m 2022-12-31T00:54:40.73
IV.ASSB.HHN. ML:0.8 0.000032037065 0.16 AML other m 2022-12-31T00:54:39.89
IV.MOMA.HHE. ML:0.0 0.00064395735 0.1 AML other m 2022-12-31T00:54:31.31
IV.MOMA.HHN. ML:0.0 0.00017010085 0.12 AML other m 2022-12-31T00:54:31.47
IV.MOMA.HNE. ML:0.0 0.0006207397500000001 0.09 AML other m 2022-12-31T00:54:31.32
IV.MOMA.HNN. ML:0.0 0.00056096835 0.09 AML other m 2022-12-31T00:54:30.90
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