Earthquake with magnitude of ML 1.2 on date 23-09-2021 and time 18:21:02 (UTC) in region 1 km W Ussita (MC)

A magnitude ML 1.2 earthquake occured in region: 1 km W Ussita (MC), on

  • 23-09-2021 18:21:02 (UTC)
  • 23-09-2021 20:21:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.948, 13.128 at 9 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.

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 1 444 444
Visso MC 4 1107 1551
Castelsantangelo sul Nera MC 6 281 1832
Bolognola MC 10 142 1974
Acquacanina MC 10 121 2095
Fiastra MC 10 559 2654
Preci PG 10 724 3378
Fiordimonte MC 11 202 3580
Monte Cavallo MC 12 145 3725
Pieve Torina MC 13 1458 5183
Pievebovigliana MC 13 866 6049
Muccia MC 17 915 6964
Montemonaco AP 17 604 7568
Sarnano MC 17 3264 10832
Norcia PG 17 4957 15789
Montefortino FM 18 1178 16967
Sellano PG 18 1079 18046
Amandola FM 19 3629 21675
Serravalle di Chienti MC 20 1070 22745

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Foligno (57155 inhabitants)
57 Km NW of Teramo (54892 inhabitants)
58 Km NE of Terni (111501 inhabitants)
63 Km E of Perugia (166134 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
96 Km NW of Montesilvano (53738 inhabitants)
100 Km S of Fano (60888 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.2 2021-09-23
18:21:02
42.9475 13.1278 9 2021-09-23
18:39:46
Sala Sismica INGV-Roma 95794181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-23 18:21:02 ± 0.06
Latitude 42.9475 ± 0.0027
Longitude 13.1278 ± 0.0049
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95794181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 336
Semi-minor axis of confidence ellipse (meter) 294
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 48
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.38221
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 18
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 19
Type of magnitude ML
Reference to an origin 95794181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-23 18:39:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-09-23T18:21:34.83 3.0 undecidable manual S -1.39 0
IV.ARVD.HHZ. 2021-09-23T18:21:24.28 3.0 undecidable manual S 0.38 0
IV.EL6.EHZ. 2021-09-23T18:21:17.30 0.6 undecidable manual S 357 0.3822 50 0.06 47
IV.ASSB.HHZ. 2021-09-23T18:21:16.46 0.6 undecidable manual S 286 0.3561 50 0 48
IV.LNSS.HNE. 2021-09-23T18:21:16.21 0.6 undecidable manual S 191 0.3507 50 -0.09 47
IV.SMA1.EHZ. 2021-09-23T18:21:16.44 0.6 undecidable manual S 154 0.3516 50 0.11 47
IV.GAVE.EHZ. 2021-09-23T18:21:15.36 0.6 undecidable manual S 214 0.3076 50 0.34 45
IV.T1299.EHE. 2021-09-23T18:21:14.79 0.3 undecidable manual S 160 0.3327 50 -0.99 53
IV.MF5.EHN. 2021-09-23T18:21:13.67 0.3 undecidable manual S 80 0.2464 108 0.73 60
IV.MTRA.EHE. 2021-09-23T18:21:13.83 0.3 undecidable manual S 134 0.2743 106 -0.15 71
IV.MML1.EHZ. 2021-09-23T18:21:11.85 0.3 undecidable manual S 326 0.2014 112 0.53 66
IV.GUMA.HHZ. 2021-09-23T18:21:11.37 0.3 undecidable manual S 53 0.1907 113 0.44 67
IV.T1299.EHE. 2021-09-23T18:21:10.89 0.3 undecidable manual P 160 0.3327 50 0.52 64
IV.GAVE.EHZ. 2021-09-23T18:21:10.03 0.1 undecidable manual P 214 0.3076 50 0.1 94
IV.LNSS.HNE. 2021-09-23T18:21:10.77 0.3 undecidable manual P 191 0.3507 50 0.1 70
IV.SMA1.EHZ. 2021-09-23T18:21:10.34 0.3 undecidable manual P 154 0.3516 50 -0.34 67
IV.PF6.EHE. 2021-09-23T18:21:10.84 0.3 undecidable manual S 14 0.1961 112 -0.3 69
IV.ASSB.HHZ. 2021-09-23T18:21:10.72 0.3 undecidable manual P 286 0.3561 50 -0.04 71
IV.EL6.EHZ. 2021-09-23T18:21:10.95 0.3 undecidable manual P 357 0.3822 50 -0.26 68
IV.CSP1.EHZ. 2021-09-23T18:21:09.35 0.3 undecidable manual S 21 0.1547 117 -0.34 69
IV.MTRA.EHE. 2021-09-23T18:21:09.12 0.3 undecidable manual P 134 0.2743 106 -0.21 70
IV.MF5.EHN. 2021-09-23T18:21:09.22 0.1 undecidable manual P 80 0.2464 108 0.49 88
IV.MMO1.EHE. 2021-09-23T18:21:09.53 0.3 undecidable manual S 108 0.1538 118 -0.11 73
IV.NRCA.HHZ. 2021-09-23T18:21:08.42 0.3 undecidable manual S 185 0.1142 125 0.07 74
IT.MTCL.HGE. 2021-09-23T18:21:08.08 0.6 undecidable manual S 296 0.1043 127 0.02 50
IV.CESI.HHZ. 2021-09-23T18:21:07.73 3.0 undecidable manual Pg 0.2 0
IV.PF6.EHE. 2021-09-23T18:21:07.50 0.3 undecidable manual P 14 0.1961 112 -0.19 71
IV.FDMO.HHZ. 2021-09-23T18:21:07.13 0.3 undecidable manual S 342 0.0935 131 -0.59 65
IV.MML1.EHZ. 2021-09-23T18:21:07.79 0.1 undecidable manual P 326 0.2014 112 -0.01 98
IV.GUMA.HHZ. 2021-09-23T18:21:07.69 0.1 undecidable manual P 53 0.1907 113 0.12 96
IV.MMO1.EHE. 2021-09-23T18:21:06.73 0.3 undecidable manual P 108 0.1538 118 -0.1 73
IV.NRCA.HHZ. 2021-09-23T18:21:06.31 0.1 undecidable manual P 185 0.1142 125 0.23 95
IV.FEMA.HNE. 2021-09-23T18:21:06.80 0.3 undecidable manual S 284 0.0585 144 -0.01 76
IV.MC2.EHZ. 2021-09-23T18:21:06.41 0.3 undecidable manual S 129 0.0576 144 -0.37 70
IT.MTCL.HGE. 2021-09-23T18:21:06.02 0.1 undecidable manual P 296 0.1043 127 0.12 98
IV.CSP1.EHZ. 2021-09-23T18:21:06.73 0.1 undecidable manual P 21 0.1547 117 -0.13 97
IV.FDMO.HHZ. 2021-09-23T18:21:05.61 0.1 undecidable manual P 342 0.0935 131 -0.11 98
IV.FEMA.HNE. 2021-09-23T18:21:05.35 0.1 undecidable manual P 284 0.0585 144 0.16 98
IV.MC2.EHZ. 2021-09-23T18:21:05.12 0.1 undecidable manual P 129 0.0576 144 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:1.1 0.00017923645 0.1792 AML other m 2021-09-23T18:21:08.77
IV.FDMO.HHN. ML:1 0.00013117488 0.2816 AML other m 2021-09-23T18:21:09.16
IV.NRCA.HHN. ML:1.5 0.0003915 0.18 AML other m 2021-09-23T18:21:09.20
IV.NRCA.HHE. ML:1.5 0.0003303843 0.0896 AML other m 2021-09-23T18:21:09.38
IV.CSP1.EHE. ML:1.4 0.0002023625 0.2432 AML other m 2021-09-23T18:21:10.39
IV.CSP1.EHN. ML:1.4 0.00023184375 0.3712 AML other m 2021-09-23T18:21:11.52
IV.CESI.HHE. ML:0.9 6.0198695E-5 0.2048 AML other m 2021-09-23T18:21:11.92
IV.CESI.HHN. ML:1.2 0.0001215033 0.2432 AML other m 2021-09-23T18:21:12.04
IV.GUMA.HHN. ML:1.4 0.0001785 1.48 AML other m 2021-09-23T18:21:13.08
IV.MML1.EHN. ML:1.1 8.085E-5 0.16 AML other m 2021-09-23T18:21:13.20
IV.MML1.EHE. ML:0.8 3.857414E-5 0.2432 AML other m 2021-09-23T18:21:13.81
IV.GUMA.HHE. ML:1.3 0.000139 0.38 AML other m 2021-09-23T18:21:14.67
IV.GAVE.EHE. ML:1.3 9.132888E-5 0.1664 AML other m 2021-09-23T18:21:16.31
IV.ASSB.HHE. ML:0.9 3.1820765E-5 0.256 AML other m 2021-09-23T18:21:17.04
IV.GAVE.EHN. ML:1.2 7.725E-5 1.54 AML other m 2021-09-23T18:21:17.10
IV.ASSB.HHN. ML:1 3.313135E-5 0.192 AML other m 2021-09-23T18:21:16.99
IV.NRCA.HNE. ML:1.4 0.00030188955 0.192 AML other m 2021-09-23T18:21:09.38
IV.EL6.EHE. ML:1 3.142095E-5 0.2816 AML other m 2021-09-23T18:21:21.50
IV.EL6.EHN. ML:1 3.1920425E-5 0.3584 AML other m 2021-09-23T18:21:21.68
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