Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 21-01-2023 and time 09:38:54 (Italy) in region 6 km SE Castelsantangelo sul Nera (MC)

A magnitude ML 1.8 earthquake occured in region: 6 km SE Castelsantangelo sul Nera (MC), on

  • 21-01-2023 08:38:54 (UTC)
  • 21-01-2023 09:38:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8700, 13.2130 at 6 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
Castelsantangelo sul Nera MC 6 281 281
Montemonaco AP 10 604 885
Ussita MC 10 444 1329
Montegallo AP 10 523 1852
Visso MC 12 1107 2959
Arquata del Tronto AP 13 1178 4137
Norcia PG 13 4957 9094
Montefortino FM 13 1178 10272
Bolognola MC 14 142 10414
Preci PG 14 724 11138
Amandola FM 17 3629 14767
Acquacanina MC 18 121 14888
Fiastra MC 19 559 15447
Comunanza AP 19 3166 18613
Accumoli RI 20 667 19280
Acquasanta Terme AP 20 2916 22196
Sarnano MC 20 3264 25460

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km E of Foligno (57155 inhabitants)
47 Km NW of Teramo (54892 inhabitants)
58 Km NE of Terni (111501 inhabitants)
60 Km N of L'Aquila (69753 inhabitants)
72 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
87 Km S of Ancona (100861 inhabitants)
93 Km W of Pescara (121014 inhabitants)
97 Km NW of Chieti (51815 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 1.8 2023-01-21
08:38:54		 42.87 13.2127 7 2024-03-01
17:18:14		 Bollettino Sismico Italiano INGV 119926001
Reviewed
Rev100 		ML 1.8 2023-01-21
08:38:54		 42.8678 13.2143 7 2023-01-21
08:49:28		 Sala Sismica INGV-Roma 113713081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-01-21 08:38:54 ± 0.07
Latitude 42.8700 ± 0.0018
Longitude 13.2127 ± 0.0037
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 119926001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 236
Semi-minor axis of confidence ellipse (meter) 105
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 240.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.04227
Epicentral distance of station farthest from the epicenter (degree) 0.30037
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 113713081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-01-21 08:49:28

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 119926001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-08-07 16:03:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2023-01-21T08:39:06.13 0.6 undecidable manual S 324 33.3444 101 0.09 47
IV.LNSS.HHN. 2023-01-21T08:39:05.94 0.3 undecidable manual S 205 32.8449 101 0.09 71
IV.PF6.EHZ. 2023-01-21T08:39:04.85 0.6 undecidable manual S 357 29.748 102 0.03 48
IV.CESI.HNZ. 2023-01-21T08:39:04.88 0.3 undecidable manual S 301 29.1486 102 0.26 68
IV.SMA1.EHE. 2023-01-21T08:39:04.48 0.3 undecidable manual S 159 28.3494 103 0.12 71
IV.CSP1.EHZ. 2023-01-21T08:39:03.15 0.3 undecidable manual S 359 24.6531 105 0.06 72
IV.FDMO.HHZ. 2023-01-21T08:39:02.05 0.6 undecidable manual S 331 21.0678 107 0.14 47
IV.MTRA.EHZ. 2023-01-21T08:39:01.76 0.6 undecidable manual S 130 19.5693 108 0.36 45
IV.LNSS.HHN. 2023-01-21T08:39:00.75 0.1 undecidable manual P 205 32.8449 101 -0.2 92
IV.PF6.EHZ. 2023-01-21T08:39:00.45 0.1 undecidable manual P 357 29.748 102 0.09 94
IV.MML1.EHZ. 2023-01-21T08:39:00.71 0.1 undecidable manual P 324 33.3444 101 -0.35 89
IV.SMA1.EHE. 2023-01-21T08:38:59.84 0.1 undecidable manual P 159 28.3494 103 -0.25 92
IV.CSP1.EHZ. 2023-01-21T08:38:59.34 0.3 undecidable manual P 359 24.6531 105 -0.01 73
IV.CESI.HNZ. 2023-01-21T08:38:59.94 0.1 undecidable manual P 301 29.1486 102 -0.3 91
IV.MMO1.EHZ. 2023-01-21T08:38:58.55 0.1 undecidable manual S 71 9.7791 123 0.22 95
IV.NRCA.HHZ. 2023-01-21T08:38:58.18 0.1 undecidable manual S 243 8.9799 126 0.09 98
IV.MTRA.EHZ. 2023-01-21T08:38:58.45 0.1 undecidable manual P 130 19.5693 108 0.07 97
IV.FDMO.HHZ. 2023-01-21T08:38:58.68 0.1 undecidable manual P 331 21.0678 107 0.01 98
IV.MC2.EHZ. 2023-01-21T08:38:57.02 0.1 undecidable manual S 337 4.995 142 -0.06 99
7F.SIB2.EHN. 2023-01-21T08:38:57.64 0.1 undecidable manual S 72 7.7811 130 -0.12 98
IV.MC2.EHZ. 2023-01-21T08:38:56.00 0.1 undecidable manual P 337 4.995 142 0.11 98
IV.NRCA.HHZ. 2023-01-21T08:38:56.62 0.1 positive manual P 243 8.9799 126 0.15 97
7F.SIB1.EHZ. 2023-01-21T08:38:56.01 0.1 undecidable manual P 60 5.3946 140 0.07 99
IV.MMO1.EHZ. 2023-01-21T08:38:56.73 0.1 positive manual P 71 9.7791 123 0.12 97
7F.SIB2.EHN. 2023-01-21T08:38:56.28 0.1 undecidable manual P 72 7.7811 130 0 100
7F.SIB3.EHN. 2023-01-21T08:38:56.60 0.3 undecidable manual S 83 4.6953 144 -0.42 69
7F.SIB3.EHN. 2023-01-21T08:38:55.76 0.1 undecidable manual P 83 4.6953 144 -0.09 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.9 0.0014338390000000001 0.1216 AML other m 2023-01-21T08:38:58.34
IV.NRCA.HNN. ML:1.9 0.001335 0.12 AML other m 2023-01-21T08:38:58.40
IV.MMO1.EHN. ML:1.1 0.00020677045 0.1216 AML other m 2023-01-21T08:38:58.67
IV.NRCA.HNE. ML:1.9 0.00138 0.12 AML other m 2023-01-21T08:38:59.25
IV.NRCA.HHE. ML:2.0 0.00152 0.12 AML other m 2023-01-21T08:38:59.25
IV.MMO1.EHE. ML:1.2 0.000282179905 0.1408 AML other m 2023-01-21T08:38:59.73
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