Earthquake with magnitude of ML 0.8 on date 21-10-2021 and time 03:54:04 (Italy) in region 2 km SW Ussita (MC)

A magnitude ML 0.8 earthquake occured in region: 2 km SW Ussita (MC), on

  • 21-10-2021 01:54:04 (UTC)
  • 21-10-2021 03:54:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.929, 13.125 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 2 444 444
Visso MC 3 1107 1551
Castelsantangelo sul Nera MC 4 281 1832
Preci PG 9 724 2556
Bolognola MC 11 142 2698
Acquacanina MC 12 121 2819
Fiastra MC 12 559 3378
Monte Cavallo MC 12 145 3523
Fiordimonte MC 13 202 3725
Pieve Torina MC 14 1458 5183
Norcia PG 15 4957 10140
Pievebovigliana MC 15 866 11006
Sellano PG 17 1079 12085
Montemonaco AP 17 604 12689
Montefortino FM 18 1178 13867
Muccia MC 18 915 14782
Sarnano MC 19 3264 18046
Montegallo AP 20 523 18569
Amandola FM 20 3629 22198

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
56 Km NW of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
63 Km E of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
96 Km W 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 0.8 2021-10-21
01:54:04
42.9288 13.1252 9 2021-10-21
02:03:14
Sala Sismica INGV-Roma 96818251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 01:54:04 ± 0.14
Latitude 42.9288 ± 0.0036
Longitude 13.1252 ± 0.0037
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96818251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 433
Semi-minor axis of confidence ellipse (meter) 218
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 29
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.04946
Epicentral distance of station farthest from the epicenter (degree) 0.17807
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 7
Type of magnitude ML
Reference to an origin 96818251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 02:03:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CESI.HHZ. 2021-10-21T01:54:12.33 0.3 undecidable manual S 295 0.1781 113 -0.02 75
IV.MMO1.EHZ. 2021-10-21T01:54:11.24 0.3 undecidable manual S 101 0.1502 117 -0.14 73
IV.NRCA.HHZ. 2021-10-21T01:54:09.52 0.3 undecidable manual S 185 0.0953 129 -0.08 75
IV.CESI.HHZ. 2021-10-21T01:54:09.08 0.1 undecidable manual P 295 0.1781 113 -0.11 98
IV.MC2.EHZ. 2021-10-21T01:54:08.41 0.3 undecidable manual S 110 0.0495 147 0 77
IV.MMO1.EHZ. 2021-10-21T01:54:08.62 0.6 positive manual P 101 0.1502 117 -0.01 50
IV.FDMO.HHZ. 2021-10-21T01:54:08.00 0.6 negative manual P 346 0.1115 125 0.12 49
IV.MC2.EHZ. 2021-10-21T01:54:07.04 0.1 negative manual P 110 0.0495 147 0.13 100
IV.NRCA.HHZ. 2021-10-21T01:54:07.75 0.3 negative manual P 185 0.0953 129 0.15 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.7 6.485E-5 0.08 AML other m 2021-10-21T01:54:09.73
IV.NRCA.HHN. ML:0.5 4.692479E-5 0.1008 AML other m 2021-10-21T01:54:10.68
IV.NRCA.HNE. ML:1 0.00014530497 0.6192 AML other m 2021-10-21T01:54:09.22
IV.FDMO.HHE. ML:-0.1 1.1993179E-5 0.16 AML other m 2021-10-21T01:54:11.86
IV.FDMO.HHN. ML:0.1 1.50845325E-5 0.24 AML other m 2021-10-21T01:54:12.16
IV.CESI.HNE. ML:1.3 0.00014796465 1.2192 AML other m 2021-10-21T01:54:11.69
IV.CESI.HNN. ML:1.4 0.0001979453 0.7408 AML other m 2021-10-21T01:54:11.20
IV.CESI.HHE. ML:0.3 1.688823E-5 0.24 AML other m 2021-10-21T01:54:12.36
IV.CESI.HHN. ML:0.7 3.483842E-5 0.12 AML other m 2021-10-21T01:54:12.61
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