Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 21-09-2023 and time 02:34:07 (UTC) in region 3 km NW Ussita (MC)

A magnitude ML 1.2 earthquake occured in region: 3 km NW Ussita (MC), on

  • 21-09-2023 02:34:07 (UTC)
  • 21-09-2023 04:34:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9670, 13.1240 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
Ussita MC 3 444 444
Visso MC 5 1107 1551
Fiastra MC 8 559 2110
Acquacanina MC 8 121 2231
Castelsantangelo sul Nera MC 8 281 2512
Fiordimonte MC 8 202 2714
Bolognola MC 9 142 2856
Monte Cavallo MC 10 145 3001
Pieve Torina MC 11 1458 4459
Pievebovigliana MC 11 866 5325
Preci PG 12 724 6049
Muccia MC 14 915 6964
Sarnano MC 16 3264 10228
Montefortino FM 18 1178 11406
Sellano PG 18 1079 12485
Montemonaco AP 18 604 13089
Serravalle di Chienti MC 18 1070 14159
Amandola FM 19 3629 17788
Cessapalombo MC 19 512 18300
Camerino MC 19 6974 25274
Norcia PG 19 4957 30231

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
58 Km NW of Teramo (54892 inhabitants)
60 Km NE of Terni (111501 inhabitants)
62 Km E of Perugia (166134 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
79 Km SW of Ancona (100861 inhabitants)
98 Km NW of Montesilvano (53738 inhabitants)
98 Km S of Fano (60888 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 1.2 2023-09-21
02:34:07		 42.9668 13.1243 8 2023-09-21
02:38:09		 Sala Sismica INGV-Roma 121293191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 02:34:07 ± 0.09
Latitude 42.9668 ± 0.0045
Longitude 13.1243 ± 0.0074
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121293191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 589
Semi-minor axis of confidence ellipse (meter) 382
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 66
Circular confidence region, given by single value of horizontal uncertainty (meter) 590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.54769
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 121293191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 02:38:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2023-09-21T02:34:27.25 0.3 undecidable manual S 346 60.7947 50 0.67 61
IV.RCAV.EHZ. 2023-09-21T02:34:26.45 3.0 undecidable manual P -2.46 0
IV.CING.HHZ. 2023-09-21T02:34:22.26 0.6 undecidable manual S 7 45.7209 50 -0.3 46
IV.SMA1.EHZ. 2023-09-21T02:34:21.61 1.0 undecidable manual S 155 41.0256 50 0.29 24
IV.SNTG.HHZ. 2023-09-21T02:34:20.05 0.6 undecidable manual S 335 35.2425 50 0.28 47
IV.ASSB.HHZ. 2023-09-21T02:34:20.93 0.6 undecidable manual S 283 38.7279 50 0.24 47
IV.ARVD.HHZ. 2023-09-21T02:34:18.18 0.6 undecidable manual P 346 60.7947 50 -0.23 45
IV.MF5.EHZ. 2023-09-21T02:34:17.64 0.6 undecidable manual S 85 27.3504 107 0.49 46
IV.TERO.HHZ. 2023-09-21T02:34:17.17 1.0 negative manual P 134 54.6009 50 -0.29 23
IV.GUMA.HHZ. 2023-09-21T02:34:15.23 0.6 undecidable manual S 58 20.1687 112 0.43 47
IV.CING.HHZ. 2023-09-21T02:34:15.69 0.6 undecidable manual P 7 45.7209 50 -0.4 45
IV.SMA1.EHZ. 2023-09-21T02:34:15.03 0.1 undecidable manual P 155 41.0256 50 -0.35 91
IV.ASSB.HHZ. 2023-09-21T02:34:14.91 0.6 undecidable manual P 283 38.7279 50 -0.1 48
IV.SNTG.HHZ. 2023-09-21T02:34:14.60 1.0 undecidable manual P 335 35.2425 50 0.12 24
IV.NRCA.HHZ. 2023-09-21T02:34:13.77 0.6 undecidable manual S 183 14.7741 119 0.64 44
IV.MF5.EHZ. 2023-09-21T02:34:13.09 0.6 undecidable manual P 85 27.3504 107 0.12 49
IV.MMO1.EHZ. 2023-09-21T02:34:13.82 0.6 undecidable manual S 114 18.0708 114 -0.32 48
IV.GUMA.HHZ. 2023-09-21T02:34:11.56 0.6 negative manual P 58 20.1687 112 -0.05 51
IV.MMO1.EHZ. 2023-09-21T02:34:10.93 0.6 negative manual P 114 18.0708 114 -0.3 48
IV.FDMO.HHZ. 2023-09-21T02:34:10.99 0.6 undecidable manual S 339 8.2806 135 -0.31 50
IV.NRCA.HHZ. 2023-09-21T02:34:10.85 0.6 positive manual P 183 14.7741 119 0.2 49
IV.FDMO.HHZ. 2023-09-21T02:34:09.34 0.1 positive manual P 339 8.2806 135 -0.25 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:1.4 0.00038749999999999993 1.04 AML other m 2023-09-21T02:34:11.90
IV.FDMO.HHE. ML:1.4 0.0004445 0.2 AML other m 2023-09-21T02:34:12.05
IV.NRCA.HHN. ML:1.4 0.000243 0.22 AML other m 2023-09-21T02:34:14.35
IV.MMO1.EHE. ML:1.2 0.0001265 1.52 AML other m 2023-09-21T02:34:14.14
IV.MMO1.EHN. ML:1.2 0.0001365 0.9 AML other m 2023-09-21T02:34:15.13
IV.GUMA.HHE. ML:1.6 0.000275 0.24 AML other m 2023-09-21T02:34:15.78
IV.NRCA.HHE. ML:1.4 0.00023349999999999998 0.44 AML other m 2023-09-21T02:34:16.90
IV.GUMA.HHN. ML:1.8 0.0005175000000000001 0.42 AML other m 2023-09-21T02:34:17.24
IV.ASSB.HHN. ML:1.2 0.00006715 0.34 AML other m 2023-09-21T02:34:21.78
IV.SNTG.HHN. ML:0.9 0.000034200000000000005 0.88 AML other m 2023-09-21T02:34:22.70
IV.ASSB.HHE. ML:1.1 0.0000485 0.44 AML other m 2023-09-21T02:34:22.61
IV.SNTG.HHE. ML:0.9 0.000028499999999999998 1.3 AML other m 2023-09-21T02:34:22.29
IV.CING.HHE. ML:1.2 0.000045600000000000004 0.18 AML other m 2023-09-21T02:34:23.30
IV.CING.HHN. ML:1.1 0.00003895 0.4 AML other m 2023-09-21T02:34:23.32
IV.SMA1.EHN. ML:1.0 0.000034049999999999994 0.96 AML other m 2023-09-21T02:34:28.22
IV.SMA1.EHE. ML:1.1 0.00004085 1.36 AML other m 2023-09-21T02:34:30.93
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