Earthquake with magnitude of ML 0.9 on date 23-12-2020 and time 09:30:27 (Italy) in region 3 km E Ussita (MC)

A magnitude ML 0.9 earthquake occured in region: 3 km E Ussita (MC), on

  • 23-12-2020 08:30:27 (UTC)
  • 23-12-2020 09:30:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.95, 13.18 at 17 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 3 444 444
Castelsantangelo sul Nera MC 6 281 725
Bolognola MC 7 142 867
Visso MC 7 1107 1974
Acquacanina MC 9 121 2095
Fiastra MC 10 559 2654
Fiordimonte MC 12 202 2856
Montemonaco AP 13 604 3460
Montefortino FM 14 1178 4638
Preci PG 14 724 5362
Sarnano MC 14 3264 8626
Pievebovigliana MC 15 866 9492
Pieve Torina MC 15 1458 10950
Monte Cavallo MC 15 145 11095
Amandola FM 15 3629 14724
Montegallo AP 17 523 15247
Norcia PG 19 4957 20204
Muccia MC 19 915 21119
Gualdo MC 19 815 21934
Cessapalombo MC 19 512 22446
Comunanza AP 19 3166 25612

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
54 Km NW of Teramo (54892 inhabitants)
61 Km NE of Terni (111501 inhabitants)
66 Km E of Perugia (166134 inhabitants)
69 Km N of L'Aquila (69753 inhabitants)
80 Km SW of Ancona (100861 inhabitants)
93 Km NW of Montesilvano (53738 inhabitants)
100 Km NW of Pescara (121014 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 0.9 2020-12-23
08:30:27
42.95 13.18 17 2020-12-23
08:38:42
Sala Sismica INGV-Roma 85644771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-23 08:30:27 ± 0.21
Latitude 42.95 ± 0.01
Longitude 13.18 ± 0.01
Depth (km) 17 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85644771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 952
Semi-minor axis of confidence ellipse (meter) 652
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 126
Circular confidence region, given by single value of horizontal uncertainty (meter) 950
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.21044
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 85644771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-23 08:38:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EUCT.HNZ. 2020-12-23T08:32:10.55 3.0 undecidable manual Sn 4.66 0
OT.TAR1.HHZ. 2020-12-23T08:32:05.70 3.0 undecidable manual Sn 0.25 0
MN.PDG.HHZ. 2020-12-23T08:31:40.59 3.0 undecidable manual Pg 13.65 0
IV.TDS.HHZ. 2020-12-23T08:31:33.40 3.0 undecidable manual Pg 9.37 0
IV.MILN.HNZ. 2020-12-23T08:31:31.46 3.0 undecidable manual Pg 9.12 0
IV.SPS2.HHZ. 2020-12-23T08:31:30.66 3.0 positive manual Pn 2.19 0
OT.TAR1.HHZ. 2020-12-23T08:31:24.16 3.0 positive manual Pn 3.39 0
IV.FIR.HHZ. 2020-12-23T08:31:18.44 3.0 undecidable manual Sg 1.48 0
IV.VAGA.HHZ. 2020-12-23T08:31:17.82 3.0 undecidable manual Sg 1.82 0
IV.CRAC.EHZ. 2020-12-23T08:31:16.43 3.0 positive manual Pn 0.08 0
IV.IMOL.HNZ. 2020-12-23T08:31:15.69 3.0 undecidable manual Sn -1.38 0
IV.OFFI.HHZ. 2020-12-23T08:31:07.62 3.0 undecidable manual P 0
IV.CRTC.HHZ. 2020-12-23T08:30:53.84 3.0 undecidable manual Sn 1.21 0
IV.ATFO.HHZ. 2020-12-23T08:30:51.79 3.0 undecidable manual Sg 0.73 0
IT.LRNO.HNZ. 2020-12-23T08:30:49.70 3.0 undecidable manual Pn -1.58 0
IV.MF5.EHZ. 2020-12-23T08:30:36.24 0.6 undecidable manual S 79 0.2104 115 0.02 49
IV.CESI.HHZ. 2020-12-23T08:30:36.60 0.6 undecidable manual S 286 0.2068 116 0.48 45
IV.CSP1.EHZ. 2020-12-23T08:30:34.49 0.6 undecidable manual S 8 0.1457 128 -0.07 49
IV.FDMO.HHZ. 2020-12-23T08:30:33.70 0.6 undecidable manual S 324 0.1106 137 -0.09 49
IV.NRCA.HHZ. 2020-12-23T08:30:33.67 0.6 undecidable manual S 202 0.1232 134 -0.38 46
IV.MC2.EHZ. 2020-12-23T08:30:32.62 0.3 undecidable manual S 166 0.0369 164 -0.1 75
IV.MF5.EHZ. 2020-12-23T08:30:32.49 0.1 undecidable manual P 79 0.2104 115 0.12 97
IV.CESI.HHZ. 2020-12-23T08:30:32.30 0.1 undecidable manual P 286 0.2068 116 -0.02 99
IV.NRCA.HHZ. 2020-12-23T08:30:31.08 0.1 undecidable manual P 202 0.1232 134 -0.05 99
IV.CSP1.EHZ. 2020-12-23T08:30:31.10 0.1 undecidable manual P 8 0.1457 128 -0.32 93
IV.MC2.EHZ. 2020-12-23T08:30:30.77 0.1 undecidable manual P 166 0.0369 164 0.41 94
IV.FDMO.HHZ. 2020-12-23T08:30:30.95 0.1 undecidable manual P 324 0.1106 137 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.6 3.69E-5 0.1 AML other m 2020-12-23T08:30:33.79
IV.FDMO.HHN. ML:1 8.31E-5 1.88 AML other m 2020-12-23T08:30:34.05
IV.NRCA.HHN. ML:1.2 0.00010945 0.46 AML other m 2020-12-23T08:30:34.03
IV.NRCA.HHE. ML:1 8.265E-5 0.78 AML other m 2020-12-23T08:30:35.97
IV.CESI.HHE. ML:0.7 2.79E-5 0.22 AML other m 2020-12-23T08:30:36.94
IV.CESI.HHN. ML:0.8 3.74E-5 1.06 AML other m 2020-12-23T08:30:37.82
IV.CSP1.EHE. ML:0.7 3.465404E-5 0.16 AML other m 2020-12-23T08:30:34.67
IV.CSP1.EHN. ML:0.8 4.72327745E-5 0.16 AML other m 2020-12-23T08:30:34.59
IV.CESI.HNE. ML:1 5.222817E-5 0.6528 AML other m 2020-12-23T08:30:36.87
IV.CESI.HNN. ML:1.1 6.472458E-5 0.736 AML other m 2020-12-23T08:30:36.41
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download