Earthquake with magnitude of ML 0.8 on date 22-10-2021 and time 00:31:58 (Italy) in region 4 km SW Sarnano (MC)

A magnitude ML 0.8 earthquake occured in region: 4 km SW Sarnano (MC), on

  • 21-10-2021 22:31:58 (UTC)
  • 22-10-2021 00:31:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.02, 13.266 at 26 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
Sarnano MC 4 3264 3264
Bolognola MC 4 142 3406
Acquacanina MC 7 121 3527
Gualdo MC 8 815 4342
Amandola FM 9 3629 7971
Fiastra MC 9 559 8530
Cessapalombo MC 10 512 9042
Montefortino FM 11 1178 10220
San Ginesio MC 11 3498 13718
Camporotondo di Fiastrone MC 13 563 14281
Ussita MC 13 444 14725
Penna San Giovanni MC 14 1108 15833
Caldarola MC 14 1823 17656
Comunanza AP 14 3166 20822
Sant'Angelo in Pontano MC 14 1436 22258
Montemonaco AP 14 604 22862
Monte San Martino MC 14 765 23627
Fiordimonte MC 14 202 23829
Smerillo FM 15 365 24194
Pievebovigliana MC 15 866 25060
Ripe San Ginesio MC 16 852 25912
Montefalcone Appennino FM 16 424 26336
Belforte del Chienti MC 16 1886 28222
Castelsantangelo sul Nera MC 17 281 28503
Visso MC 17 1107 29610
Pieve Torina MC 18 1458 31068
Colmurano MC 18 1263 32331
Serrapetrona MC 19 966 33297
Santa Vittoria in Matenano FM 19 1330 34627
Muccia MC 19 915 35542
Force AP 19 1354 36896
Servigliano FM 20 2336 39232
Falerone FM 20 3337 42569

Municipalities with at least 50000 inhabitants

An earthquake occurred to
46 Km E of Foligno (57155 inhabitants)
54 Km NW of Teramo (54892 inhabitants)
70 Km SW of Ancona (100861 inhabitants)
72 Km NE of Terni (111501 inhabitants)
72 Km E of Perugia (166134 inhabitants)
75 Km N of L'Aquila (69753 inhabitants)
92 Km NW of Montesilvano (53738 inhabitants)
94 Km S of Fano (60888 inhabitants)
99 Km NW of Pescara (121014 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 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 0.8 2021-10-21
22:31:58
43.0197 13.2655 26 2021-10-21
22:39:01
Sala Sismica INGV-Roma 96859581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 22:31:58 ± 0.17
Latitude 43.0197 ± 0.0045
Longitude 13.2655 ± 0.0062
Depth (km) 26 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96859581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 489
Semi-minor axis of confidence ellipse (meter) 306
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 490
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
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) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.12141
Epicentral distance of station farthest from the epicenter (degree) 0.35973
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:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96859581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 22:39:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CING.HHZ. 2021-10-21T22:32:12.55 0.1 undecidable manual S 352 0.3597 116 -0.04 96
IV.NRCA.HHZ. 2021-10-21T22:32:09.08 0.1 undecidable manual S 211 0.2167 132 0.02 99
IV.MML1.EHZ. 2021-10-21T22:32:09.68 0.1 undecidable manual S 294 0.2338 129 0.23 96
IV.MF5.EHZ. 2021-10-21T22:32:07.78 0.1 undecidable manual S 103 0.1457 144 0.15 97
IV.MMO1.EHZ. 2021-10-21T22:32:07.09 0.1 undecidable manual S 160 0.1286 147 -0.26 96
IV.FDMO.HHZ. 2021-10-21T22:32:07.16 0.1 undecidable manual S 277 0.1313 147 -0.24 95
IV.MC2.EHZ. 2021-10-21T22:32:07.49 0.1 undecidable manual S 207 0.1214 149 0.25 97
IV.CING.HHZ. 2021-10-21T22:32:06.45 1.0 undecidable manual P 352 0.3597 116 -0.2 23
IV.MNTT.EHZ. 2021-10-21T22:32:05.18 0.6 negative manual P 80 0.2446 128 0.19 47
IV.MML1.EHZ. 2021-10-21T22:32:05.02 1.0 undecidable manual P 294 0.2338 129 0.18 24
IV.NRCA.HHZ. 2021-10-21T22:32:04.54 0.1 positive manual P 211 0.2167 132 -0.08 98
IV.MC2.EHZ. 2021-10-21T22:32:03.62 0.1 positive manual P 207 0.1214 149 0.04 100
IV.MF5.EHZ. 2021-10-21T22:32:03.81 0.1 negative manual P 103 0.1457 144 0.01 99
IV.MMO1.EHZ. 2021-10-21T22:32:03.42 1.0 undecidable manual P 160 0.1286 147 -0.21 24
IV.FDMO.HHZ. 2021-10-21T22:32:03.45 0.6 positive manual P 277 0.1313 147 -0.21 48
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.3 7.75E-5 1.3 AML other m 2021-10-21T22:32:09.21
IV.NRCA.HHE. ML:1.2 6.68E-5 0.1 AML other m 2021-10-21T22:32:09.70
IV.FDMO.HHE. ML:0.8 3.2890515E-5 0.1664 AML other m 2021-10-21T22:32:07.26
IV.FDMO.HHN. ML:0.6 1.796966E-5 0.1408 AML other m 2021-10-21T22:32:07.35
IV.MML1.EHE. ML:0.4 1.0061272E-5 0.32 AML other m 2021-10-21T22:32:09.91
IV.MML1.EHN. ML:0.6 1.3463563E-5 0.1408 AML other m 2021-10-21T22:32:10.43
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