Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-08-2021 and time 22:31:19 (Italy) in region 2 km NE Smerillo (FM)

A magnitude ML 1.0 earthquake occured in region: 2 km NE Smerillo (FM), on

  • 21-08-2021 20:31:19 (UTC)
  • 21-08-2021 22:31:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0210, 13.4680 at 22 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
Smerillo FM 2 365 365
Monte San Martino MC 3 765 1130
Santa Vittoria in Matenano FM 3 1330 2460
Montefalcone Appennino FM 4 424 2884
Penna San Giovanni MC 5 1108 3992
Montelparo FM 6 778 4770
Monteleone di Fermo FM 6 395 5165
Force AP 7 1354 6519
Servigliano FM 7 2336 8855
Comunanza AP 8 3166 12021
Monsampietro Morico FM 9 659 12680
Monte Rinaldo FM 9 379 13059
Falerone FM 10 3337 16396
Belmonte Piceno FM 10 646 17042
Amandola FM 10 3629 20671
Sant'Angelo in Pontano MC 11 1436 22107
Rotella AP 11 906 23013
Montottone FM 11 979 23992
Montedinove AP 11 488 24480
Monte Vidon Corrado FM 11 731 25211
Ortezzano FM 12 774 25985
Gualdo MC 12 815 26800
Montalto delle Marche AP 12 2122 28922
Montappone FM 13 1682 30604
Montefortino FM 13 1178 31782
Palmiano AP 13 196 31978
Montegiorgio FM 14 6851 38829
Sarnano MC 14 3264 42093
Monte Vidon Combatte FM 14 433 42526
Massa Fermana FM 15 963 43489
Grottazzolina FM 15 3398 46887
Monte Giberto FM 16 801 47688
Venarotta AP 16 2066 49754
Castignano AP 16 2796 52550
San Ginesio MC 16 3498 56048
Ripe San Ginesio MC 16 852 56900
Petritoli FM 16 2335 59235
Magliano di Tenna FM 16 1452 60687
Loro Piceno MC 17 2401 63088
Montemonaco AP 18 604 63692
Carassai AP 18 1100 64792
Roccafluvione AP 18 2010 66802
Ponzano di Fermo FM 18 1674 68476
Colmurano MC 18 1263 69739
Cossignano AP 18 978 70717
Mogliano MC 19 4696 75413
Rapagnano FM 19 2145 77558
Cessapalombo MC 20 512 78070
Bolognola MC 20 142 78212
Francavilla d'Ete FM 20 964 79176

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km NW of Teramo (54892 inhabitants)
63 Km E of Foligno (57155 inhabitants)
67 Km S of Ancona (100861 inhabitants)
75 Km N of L'Aquila (69753 inhabitants)
79 Km NW of Montesilvano (53738 inhabitants)
84 Km NE of Terni (111501 inhabitants)
87 Km NW of Pescara (121014 inhabitants)
88 Km E of Perugia (166134 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
98 Km SE of Fano (60888 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2021-08-21
20:31:19		 43.021 13.4675 22 2021-08-21
20:36:22		 Sala Sismica INGV-Roma 94475711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-21 20:31:19 ± 0.16
Latitude 43.0210 ± 0.0081
Longitude 13.4675 ± 0.0086
Depth (km) 22 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94475711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 659
Semi-minor axis of confidence ellipse (meter) 629
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 13
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.03327
Epicentral distance of station farthest from the epicenter (degree) 0.40200
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:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 94475711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-21 20:36:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SMA1.EHZ. 2021-08-21T20:31:34.04 0.6 undecidable manual S 194 44.622 109 0 49
IV.MML1.EHZ. 2021-08-21T20:31:33.81 0.6 undecidable manual S 284 41.4252 110 0.57 44
IV.NRCA.HHZ. 2021-08-21T20:31:31.93 0.6 undecidable manual S 234 35.4423 114 0.18 48
IV.FDMO.HHZ. 2021-08-21T20:31:30.57 0.6 undecidable manual S 273 30.8469 118 -0.09 49
IV.CSP1.EHZ. 2021-08-21T20:31:28.78 0.6 undecidable manual S 290 22.6551 128 -0.05 50
IV.MML1.EHZ. 2021-08-21T20:31:27.32 0.6 negative manual P 284 41.4252 110 0.03 49
IV.SMA1.EHZ. 2021-08-21T20:31:27.50 0.6 positive manual P 194 44.622 109 -0.25 47
IV.MNTT.EHZ. 2021-08-21T20:31:27.05 0.6 undecidable manual S 66 11.3775 149 0.24 50
IV.NRCA.HHZ. 2021-08-21T20:31:26.36 0.3 undecidable manual P 234 35.4423 114 -0.07 74
IV.GUMA.HHZ. 2021-08-21T20:31:26.63 0.6 undecidable manual S 293 11.6772 149 -0.22 49
IV.FDMO.HHZ. 2021-08-21T20:31:25.72 0.1 negative manual P 273 30.8469 118 -0.08 99
IV.MF5.EHZ. 2021-08-21T20:31:25.76 0.6 undecidable manual S 190 3.6963 169 -0.32 49
IV.CSP1.EHZ. 2021-08-21T20:31:24.66 0.1 negative manual P 290 22.6551 128 -0.09 100
IV.GUMA.HHZ. 2021-08-21T20:31:23.46 0.6 undecidable manual P 293 11.6772 149 -0.14 50
IV.MNTT.EHZ. 2021-08-21T20:31:23.61 0.3 negative manual P 66 11.3775 149 0.03 78
IV.MF5.EHZ. 2021-08-21T20:31:23.67 0.6 undecidable manual P 190 3.6963 169 0.52 47
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MNTT.EHN. ML:1.3 0.00012485747 2.0736 AML other m 2021-08-21T20:31:28.76
IV.MNTT.EHE. ML:1.2 0.00011120045000000001 0.3072 AML other m 2021-08-21T20:31:27.35
IV.CSP1.EHE. ML:1.1 0.00005675 0.2 AML other m 2021-08-21T20:31:29.38
IV.CSP1.EHN. ML:1.2 0.00008635 0.8 AML other m 2021-08-21T20:31:29.93
IV.FDMO.HHE. ML:0.7 0.0000183 0.14 AML other m 2021-08-21T20:31:30.91
IV.FDMO.HHN. ML:0.6 0.0000163 0.14 AML other m 2021-08-21T20:31:31.03
IV.NRCA.HHE. ML:1.4 0.00008125 1.84 AML other m 2021-08-21T20:31:31.99
IV.NRCA.HHN. ML:1.4 0.00008999999999999999 0.08 AML other m 2021-08-21T20:31:32.21
IV.MML1.EHE. ML:0.7 0.000014694999999999999 1.78 AML other m 2021-08-21T20:31:33.02
IV.MML1.EHN. ML:0.9 0.00002375 0.18 AML other m 2021-08-21T20:31:33.99
IV.SMA1.EHN. ML:0.8 0.000017049999999999998 0.54 AML other m 2021-08-21T20:31:41.26
IV.SMA1.EHE. ML:0.8 0.000016300000000000003 1.5 AML other m 2021-08-21T20:31:41.10
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