Earthquake with magnitude of ML 0.9 on date 16-10-2021 and time 10:50:40 (UTC) in region 4 km NW Visso (MC)

A magnitude ML 0.9 earthquake occured in region: 4 km NW Visso (MC), on

  • 16-10-2021 10:50:40 (UTC)
  • 16-10-2021 12:50:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.966, 13.064 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Visso MC 4 1107 1107
Monte Cavallo MC 6 145 1252
Ussita MC 7 444 1696
Fiordimonte MC 8 202 1898
Pieve Torina MC 9 1458 3356
Preci PG 10 724 4080
Castelsantangelo sul Nera MC 11 281 4361
Pievebovigliana MC 11 866 5227
Fiastra MC 11 559 5786
Acquacanina MC 12 121 5907
Muccia MC 13 915 6822
Bolognola MC 14 142 6964
Sellano PG 14 1079 8043
Serravalle di Chienti MC 15 1070 9113
Camerino MC 19 6974 16087
Norcia PG 19 4957 21044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
56 Km NE of Terni (111501 inhabitants)
57 Km E of Perugia (166134 inhabitants)
62 Km NW of Teramo (54892 inhabitants)
74 Km NW of L'Aquila (69753 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
98 Km S of Fano (60888 inhabitants)
99 Km NE of Viterbo (67173 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 0.9 2021-10-16
10:50:40
42.9662 13.064 11 2021-10-16
10:55:20
Sala Sismica INGV-Roma 96645171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-16 10:50:40 ± 0.07
Latitude 42.9662 ± 0.0027
Longitude 13.0640 ± 0.0049
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 96645171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 395
Semi-minor axis of confidence ellipse (meter) 246
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 60
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) 82
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.07195
Epicentral distance of station farthest from the epicenter (degree) 0.30577
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 11
Type of magnitude ML
Reference to an origin 96645171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-16 10:55:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2021-10-16T10:50:52.52 0.6 undecidable manual S 285 0.3058 50 0.07 48
IV.CSP1.EHZ. 2021-10-16T10:50:48.02 0.3 undecidable manual S 39 0.1628 121 -0.11 73
IV.MML1.EHZ. 2021-10-16T10:50:47.87 0.3 undecidable manual S 335 0.1619 121 -0.25 71
IV.ASSB.HHZ. 2021-10-16T10:50:47.36 0.3 positive manual P 285 0.3058 50 -0.19 70
IV.GAVE.EHZ. 2021-10-16T10:50:47.62 0.3 negative manual P 205 0.3004 50 0.16 70
IV.MC2.EHZ. 2021-10-16T10:50:46.57 0.1 undecidable manual S 121 0.1061 132 0.18 97
IV.CESI.HHZ. 2021-10-16T10:50:46.97 0.3 undecidable manual S 288 0.1232 128 0.1 74
IV.NRCA.HHZ. 2021-10-16T10:50:46.97 0.3 undecidable manual S 164 0.1376 125 -0.35 70
IV.CSP1.EHZ. 2021-10-16T10:50:45.06 1.0 positive manual P 39 0.1628 121 0 25
IV.MML1.EHZ. 2021-10-16T10:50:45.10 0.6 undecidable manual P 335 0.1619 121 0.05 49
IV.FDMO.HHZ. 2021-10-16T10:50:45.57 0.1 undecidable manual S 14 0.0719 143 0.07 100
IV.MC2.EHZ. 2021-10-16T10:50:44.15 0.3 undecidable manual P 121 0.1061 132 0.1 74
IV.CESI.HHZ. 2021-10-16T10:50:44.47 0.1 positive manual P 288 0.1232 128 0.14 98
IV.NRCA.HHZ. 2021-10-16T10:50:44.48 0.3 negative manual P 164 0.1376 125 -0.11 74
IV.FDMO.HHZ. 2021-10-16T10:50:43.61 1.0 undecidable manual P 14 0.0719 143 0.07 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.6 5.8332339E-5 0.1984 AML other m 2021-10-16T10:50:45.60
IV.FDMO.HHN. ML:0.5 4.1566015E-5 0.1344 AML other m 2021-10-16T10:50:45.91
IV.CESI.HNE. ML:0.8 6.47876305E-5 0.3904 AML other m 2021-10-16T10:50:47.35
IV.CESI.HHE. ML:0.9 7.4680765E-5 0.16 AML other m 2021-10-16T10:50:47.12
IV.CESI.HHN. ML:1.1 0.000112937905 0.1024 AML other m 2021-10-16T10:50:47.37
IV.NRCA.HHE. ML:0.8 6.623001E-5 0.0768 AML other m 2021-10-16T10:50:48.60
IV.NRCA.HHN. ML:1 0.000101737975 0.1216 AML other m 2021-10-16T10:50:47.18
IV.CSP1.EHE. ML:1.1 0.000102689955 0.4608 AML other m 2021-10-16T10:50:48.86
IV.CSP1.EHN. ML:1.2 0.00012072448 0.1216 AML other m 2021-10-16T10:50:48.23
IV.MML1.EHE. ML:0.6 3.1849255E-5 0.2176 AML other m 2021-10-16T10:50:48.75
IV.MML1.EHN. ML:0.6 3.304419E-5 0.1408 AML other m 2021-10-16T10:50:49.14
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