Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 16-01-2021 and time 06:27:35 (Italy) in region 3 km N Ussita (MC)

A magnitude ML 1.8 earthquake occured in region: 3 km N Ussita (MC), on

  • 16-01-2021 05:27:35 (UTC)
  • 16-01-2021 06:27:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.97, 13.13 at 11 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 6 1107 1551
Acquacanina MC 8 121 1672
Fiastra MC 8 559 2231
Fiordimonte MC 8 202 2433
Bolognola MC 8 142 2575
Castelsantangelo sul Nera MC 9 281 2856
Pieve Torina MC 11 1458 4314
Monte Cavallo MC 11 145 4459
Pievebovigliana MC 11 866 5325
Preci PG 13 724 6049
Muccia MC 14 915 6964
Sarnano MC 16 3264 10228
Montefortino FM 17 1178 11406
Montemonaco AP 18 604 12010
Amandola FM 18 3629 15639
Serravalle di Chienti MC 18 1070 16709
Cessapalombo MC 19 512 17221
Sellano PG 19 1079 18300
Camerino MC 19 6974 25274
Norcia PG 20 4957 30231

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 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)
97 Km NW of Montesilvano (53738 inhabitants)
98 Km S of Fano (60888 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 1.8 2021-01-16
05:27:35		 42.97 13.13 11 2021-01-16
05:35:43		 Sala Sismica INGV-Roma 86291201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-16 05:27:35 ± 0.06
Latitude 42.97 ± 0.00
Longitude 13.13 ± 0.00
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86291201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 391
Semi-minor axis of confidence ellipse (meter) 295
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 207
Circular confidence region, given by single value of horizontal uncertainty (meter) 390
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.07285
Epicentral distance of station farthest from the epicenter (degree) 0.49103
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 86291201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-16 05:35:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-01-16T05:27:52.38 0.6 undecidable manual S 135 0.491 50 0.27 44
IV.RM33.EHZ. 2021-01-16T05:27:51.76 0.6 undecidable manual S 172 0.4649 50 0.41 43
IV.LNSS.HHZ. 2021-01-16T05:27:49.46 0.6 undecidable manual S 190 0.3732 50 0.83 37
IV.EL6.EHZ. 2021-01-16T05:27:48.57 0.3 undecidable manual S 357 0.3597 50 0.35 66
IV.EL6.EHZ. 2021-01-16T05:27:48.31 3.0 undecidable manual P 357 0.3597 50 5.68 0
IV.SMA1.EHZ. 2021-01-16T05:27:48.60 0.6 undecidable manual S 156 0.3714 50 0.03 47
IV.ASSB.HHZ. 2021-01-16T05:27:47.96 0.6 undecidable manual S 282 0.3525 50 -0.06 47
IV.MTRA.EHZ. 2021-01-16T05:27:45.94 0.3 undecidable manual S 138 0.2887 50 -0.19 70
IV.TERO.HHZ. 2021-01-16T05:27:44.61 1.0 positive manual P 135 0.491 50 -0.27 22
IV.SAP2.EHZ. 2021-01-16T05:27:44.52 0.3 undecidable manual S 57 0.2329 50 0.05 72
IV.MF5.EHZ. 2021-01-16T05:27:44.82 0.3 undecidable manual S 86 0.241 50 0.12 71
IV.RM33.EHZ. 2021-01-16T05:27:43.93 1.0 undecidable manual P 172 0.4649 50 -0.51 21
IV.CESI.HHZ. 2021-01-16T05:27:42.42 0.3 undecidable manual S 282 0.1691 119 -0.06 73
IV.SMA1.EHZ. 2021-01-16T05:27:42.55 0.3 negative manual P 156 0.3714 50 -0.28 67
IV.GUMA.HHZ. 2021-01-16T05:27:42.65 0.3 undecidable manual S 58 0.1754 119 -0.03 74
IV.LNSS.HHZ. 2021-01-16T05:27:42.71 0.6 positive manual P 190 0.3732 50 -0.16 46
IV.ASSB.HHZ. 2021-01-16T05:27:41.94 0.6 undecidable manual P 282 0.3525 50 -0.58 42
IV.MTRA.EHZ. 2021-01-16T05:27:41.01 0.1 undecidable manual P 138 0.2887 50 -0.41 89
IV.NRCA.HHZ. 2021-01-16T05:27:41.52 0.6 undecidable manual S 185 0.1376 125 0.08 49
IV.MMO1.EHZ. 2021-01-16T05:27:41.84 0.3 undecidable manual S 116 0.1601 121 -0.32 69
IV.SAP2.EHZ. 2021-01-16T05:27:40.67 0.1 undecidable manual P 57 0.2329 50 0.2 94
IV.MC2.EHZ. 2021-01-16T05:27:40.11 0.3 undecidable manual S 144 0.0728 143 0.5 68
IV.MF5.EHZ. 2021-01-16T05:27:40.58 0.1 negative manual P 86 0.241 50 -0.02 97
IT.MTCL.HGZ. 2021-01-16T05:27:40.40 0.3 undecidable manual S 284 0.0989 134 0.1 74
IV.CESI.HHZ. 2021-01-16T05:27:39.20 0.1 negative manual P 282 0.1691 119 -0.12 96
IV.GUMA.HHZ. 2021-01-16T05:27:39.44 0.1 undecidable manual P 58 0.1754 119 0 99
IV.NRCA.HHZ. 2021-01-16T05:27:38.71 0.1 undecidable manual P 185 0.1376 125 -0.01 99
IV.MMO1.EHZ. 2021-01-16T05:27:38.89 0.1 negative manual P 116 0.1601 121 -0.25 94
IT.MTCL.HGZ. 2021-01-16T05:27:38.07 0.1 undecidable manual P 284 0.0989 134 0.01 100
IV.MC2.EHZ. 2021-01-16T05:27:37.92 0.1 undecidable manual P 144 0.0728 143 0.25 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.8 0.000604 0.08 AML other m 2021-01-16T05:27:41.60
IV.NRCA.HHE. ML:1.9 0.0007195 0.08 AML other m 2021-01-16T05:27:41.73
IV.GUMA.HNE. ML:1.8 0.000499 0.3 AML other m 2021-01-16T05:27:42.79
IV.GUMA.HHE. ML:2.1 0.0008515 0.28 AML other m 2021-01-16T05:27:42.80
IV.CESI.HHE. ML:1.3 0.000145 0.5 AML other m 2021-01-16T05:27:42.49
IV.GUMA.HNN. ML:1.8 0.000546 0.22 AML other m 2021-01-16T05:27:42.69
IV.CESI.HHN. ML:1.4 0.0001875 0.52 AML other m 2021-01-16T05:27:43.47
IV.GUMA.HHN. ML:1.8 0.000542 0.32 AML other m 2021-01-16T05:27:44.16
IV.SAP2.EHN. ML:2.7 0.00256 0.58 AML other m 2021-01-16T05:27:44.92
IV.SAP2.EHE. ML:1.9 0.0004125 0.12 AML other m 2021-01-16T05:27:45.28
IV.MTRA.EHN. ML:1.7 0.000242 0.56 AML other m 2021-01-16T05:27:46.07
IV.MTRA.EHE. ML:1.7 0.000244 0.24 AML other m 2021-01-16T05:27:46.45
IV.TERO.HHE. ML:1.3 5.1E-5 0.36 AML other m 2021-01-16T05:27:53.28
IV.TERO.HNN. ML:2.5 0.000762 0.4 AML other m 2021-01-16T05:27:56.27
IV.TERO.HNE. ML:2.5 0.0007745 0.4 AML other m 2021-01-16T05:27:56.27
IV.TERO.HHN. ML:1.6 9.385E-5 0.42 AML other m 2021-01-16T05:27:57.65
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