Earthquake with magnitude of ML 1.8 on date 21-11-2021 and time 23:03:26 (UTC) in region 4 km NW Ussita (MC)

A magnitude ML 1.8 earthquake occured in region: 4 km NW Ussita (MC), on

  • 21-11-2021 23:03:26 (UTC)
  • 22-11-2021 00:03:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.981, 13.118 at 13 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 4 444 444
Visso MC 6 1107 1551
Fiordimonte MC 7 202 1753
Fiastra MC 7 559 2312
Acquacanina MC 7 121 2433
Pieve Torina MC 9 1458 3891
Bolognola MC 9 142 4033
Pievebovigliana MC 10 866 4899
Monte Cavallo MC 10 145 5044
Castelsantangelo sul Nera MC 10 281 5325
Muccia MC 13 915 6240
Preci PG 13 724 6964
Sarnano MC 16 3264 10228
Serravalle di Chienti MC 17 1070 11298
Camerino MC 18 6974 18272
Cessapalombo MC 18 512 18784
Sellano PG 19 1079 19863
Montefortino FM 19 1178 21041
Montemonaco AP 19 604 21645
Amandola FM 19 3629 25274
Caldarola MC 20 1823 27097

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
60 Km NW of Teramo (54892 inhabitants)
60 Km NE of Terni (111501 inhabitants)
61 Km E of Perugia (166134 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
78 Km SW of Ancona (100861 inhabitants)
96 Km S of Fano (60888 inhabitants)
99 Km NW of Montesilvano (53738 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.8 2021-11-21
23:03:26
42.9807 13.1177 13 2021-11-21
23:09:57
Sala Sismica INGV-Roma 97670971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-21 23:03:26 ± 0.07
Latitude 42.9807 ± 0.0027
Longitude 13.1177 ± 0.0037
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97670971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 359
Semi-minor axis of confidence ellipse (meter) 157
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 49
Circular confidence region, given by single value of horizontal uncertainty (meter) 360
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.17357
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.7
Num. used stations 6
Type of magnitude ML
Reference to an origin 97670971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-21 23:09:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.GRAM.HHZ. 2021-11-21T23:04:53.74 3.0 undecidable manual Sg 12.81 0
MN.CLTB.HHZ. 2021-11-21T23:04:43.07 3.0 negative manual Pg 9.76 0
IV.SCIAC.HHZ. 2021-11-21T23:04:41.66 3.0 undecidable manual Pg 7.43 0
IV.CMPR.HHZ. 2021-11-21T23:04:41.57 3.0 undecidable manual Sg 5.3 0
GU.TRAV.HHZ. 2021-11-21T23:04:40.60 3.0 undecidable manual Pg 12.44 0
AC.PUK.HHZ. 2021-11-21T23:04:28.85 3.0 undecidable manual Pn 6.34 0
IX.SCL3.EHZ.02 2021-11-21T23:04:23.79 3.0 undecidable manual Sn -6.39 0
OT.OT13.EHZ. 2021-11-21T23:04:19.79 3.0 undecidable manual Sn 1.34 0
IV.MONC.HHZ. 2021-11-21T23:04:18.50 3.0 undecidable manual Pn -5.54 0
GU.GRAM.HHZ. 2021-11-21T23:04:09.25 3.0 negative manual Pg 6.58 0
IV.CFMN.HHZ. 2021-11-21T23:04:07.89 3.0 undecidable manual Sn -9.99 0
OX.VARN.HHZ. 2021-11-21T23:04:00.14 3.0 positive manual Pn -4.43 0
CR.STON.BHZ. 2021-11-21T23:03:58.32 3.0 undecidable manual Pn -1.47 0
IV.PE3.EHZ. 2021-11-21T23:03:57.02 3.0 undecidable manual Sn -4.13 0
IV.CRTC.HHZ. 2021-11-21T23:03:53.04 3.0 undecidable manual Sn -5.56 0
OT.OT17.EHZ. 2021-11-21T23:03:52.83 3.0 negative manual Pg 6.71 0
IV.MPAG.HNZ. 2021-11-21T23:03:47.89 3.0 undecidable manual Sn -9.99 0
IV.APEC.HHZ. 2021-11-21T23:03:39.92 3.0 undecidable manual Pg -0.13 0
IV.MML1.EHZ. 2021-11-21T23:03:33.66 0.6 undecidable manual S 321 0.17 105 -0.1 49
IV.MMO1.EHZ. 2021-11-21T23:03:33.66 0.6 undecidable manual S 118 0.1736 105 -0.18 48
IV.CESI.HHZ. 2021-11-21T23:03:33.47 0.6 undecidable manual S 279 0.1574 108 0.08 49
IV.CSP1.EHZ. 2021-11-21T23:03:32.49 0.6 undecidable manual S 30 0.1286 116 -0.09 49
IV.NRCA.HHZ. 2021-11-21T23:03:32.90 0.6 undecidable manual S 181 0.1466 111 -0.2 48
IV.MC2.EHZ. 2021-11-21T23:03:31.74 0.6 undecidable manual S 143 0.0863 133 0.17 49
IT.MTCL.HGN. 2021-11-21T23:03:31.42 0.6 undecidable manual S 279 0.0872 132 -0.16 49
IV.ARRO.EHZ. 2021-11-21T23:03:31.12 3.0 positive manual P -6.35 0
IV.CESI.HHZ. 2021-11-21T23:03:30.42 0.1 negative manual P 279 0.1574 108 0.08 97
IV.MML1.EHZ. 2021-11-21T23:03:30.52 1.0 negative manual P 321 0.17 105 -0.03 25
IV.MMO1.EHZ. 2021-11-21T23:03:30.64 1.0 undecidable manual P 118 0.1736 105 0.04 24
IV.NRCA.HHZ. 2021-11-21T23:03:30.16 0.1 positive manual P 181 0.1466 111 -0.02 99
IV.MC2.EHZ. 2021-11-21T23:03:29.52 0.6 undecidable manual P 143 0.0863 133 0.23 48
IT.MTCL.HGN. 2021-11-21T23:03:29.33 0.1 undecidable manual P 279 0.0872 132 0.03 100
IV.CSP1.EHZ. 2021-11-21T23:03:29.95 0.6 negative manual P 30 0.1286 116 0.08 49
IV.FDMO.HHE. 2021-11-21T23:03:28.92 0.1 undecidable manual P 338 0.0603 145 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.7 3.765E-5 1.6 AML other m 2021-11-21T23:03:34.83
IV.NRCA.HHE. ML:0.8 4.39E-5 1.04 AML other m 2021-11-21T23:03:34.83
IX.SCL3.HNE.01 ML:3.4 0.0002815 1.16 AML other m 2021-11-21T23:04:05.15
IV.MPAG.HNN. ML:2.8 0.001029 1.54 AML other m 2021-11-21T23:04:18.02
IV.MPAG.HNE. ML:2.8 0.000835 1.54 AML other m 2021-11-21T23:04:18.79
IV.CRTC.HHN. ML:1.8 6.74E-5 0.8 AML other m 2021-11-21T23:04:25.78
IV.CRTC.HHE. ML:1.8 6.695E-5 0.44 AML other m 2021-11-21T23:04:26.43
IV.CMPR.HNN. ML:3.7 0.000433 0.46 AML other m 2021-11-21T23:04:33.97
IV.CMPR.HNE. ML:3.7 0.000431 0.46 AML other m 2021-11-21T23:04:34.97
IX.SCL3.EHE.02 ML:3.2 0.0001845 0.06 AML other m 2021-11-21T23:04:48.51
IX.SCL3.EHN.02 ML:3 0.0001056 0.54 AML other m 2021-11-21T23:04:48.81
IV.CMPR.HHE. ML:2.6 3.575E-5 0.08 AML other m 2021-11-21T23:04:59.80
IV.CMPR.HHN. ML:2.9 6.265E-5 0.08 AML other m 2021-11-21T23:04:59.80
IX.SCL3.HNN.01 ML:3.5 0.0003064 1.24 AML other m 2021-11-21T23:05:01.75
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