Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 27-09-2021 and time 21:33:59 (Italy) in region 6 km SW Treia (MC)

A magnitude ML 0.9 earthquake occured in region: 6 km SW Treia (MC), on

  • 27-09-2021 19:33:59 (UTC)
  • 27-09-2021 21:33:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2810, 13.2520 at 19 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Treia MC 6 9403 9403
Pollenza MC 8 6618 16021
San Severino Marche MC 8 12726 28747
Tolentino MC 8 20069 48816
Cingoli MC 11 10352 59168
Appignano MC 12 4213 63381
Serrapetrona MC 13 966 64347
Belforte del Chienti MC 13 1886 66233
Urbisaglia MC 14 2628 68861
Gagliole MC 16 620 69481
Colmurano MC 16 1263 70744
Apiro MC 16 2280 73024
Caldarola MC 16 1823 74847
Macerata MC 17 42473 117320
Camporotondo di Fiastrone MC 17 563 117883
Poggio San Vicino MC 17 246 118129
Castelraimondo MC 18 4587 122716
Montecassiano MC 18 7125 129841
Staffolo AN 18 2253 132094
Ripe San Ginesio MC 18 852 132946
Loro Piceno MC 19 2401 135347
Petriolo MC 19 1998 137345
Cessapalombo MC 19 512 137857
Filottrano AN 19 9499 147356
Matelica MC 20 9981 157337
San Ginesio MC 20 3498 160835

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SW of Ancona (100861 inhabitants)
57 Km NE of Foligno (57155 inhabitants)
65 Km S of Fano (60888 inhabitants)
73 Km E of Perugia (166134 inhabitants)
75 Km SE of Pesaro (94582 inhabitants)
78 Km NW of Teramo (54892 inhabitants)
94 Km NE of Terni (111501 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
Bulletin
Rev1000 		ML 0.9 2021-09-27
19:33:59		 43.2813 13.2517 19 2022-03-30
13:04:38		 Bollettino Sismico Italiano INGV 101109081
Reviewed
Rev100 		ML 0.8 2021-09-27
19:34:00		 43.2685 13.2157 10 2021-09-27
19:42:35		 Sala Sismica INGV-Roma 95959731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 19:33:59 ± 0.16
Latitude 43.2813 ± 0.0054
Longitude 13.2517 ± 0.0136
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101109081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 906
Semi-minor axis of confidence ellipse (meter) 705
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 266
Circular confidence region, given by single value of horizontal uncertainty (meter) 910.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 176
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38581
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95959731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 19:42:35

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 101109081
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-18 12:08:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAPR.HNZ. 2021-09-27T19:35:47.50 3.0 undecidable manual Sg 16.83 0
AC.KBN.HHZ. 2021-09-27T19:35:36.12 3.0 negative manual Pg 14.08 0
IV.HCRL.HHZ. 2021-09-27T19:35:34.28 3.0 negative manual Pg 18.5 0
IV.MAGA.HHZ. 2021-09-27T19:35:30.78 3.0 undecidable manual Sn 4.35 0
OT.OT15.EHZ. 2021-09-27T19:35:25.68 3.0 undecidable manual Sg 5.21 0
IV.ZEN8.EHZ. 2021-09-27T19:35:19.52 3.0 undecidable manual Sn -3.14 0
IV.HVZN.HHZ. 2021-09-27T19:35:14.60 3.0 undecidable manual Pn -1.79 0
IV.SELL.HHZ. 2021-09-27T19:35:12.03 3.0 undecidable manual Pg 10.68 0
IV.ESCV.HHZ. 2021-09-27T19:35:12.06 3.0 negative manual Pn 3.03 0
MN.TRI.HHZ. 2021-09-27T19:35:10.34 3.0 undecidable manual Sn -3.22 0
IV.JOPP.HHZ. 2021-09-27T19:35:02.25 3.0 undecidable manual Pn 0.4 0
IV.COLB.HHZ. 2021-09-27T19:34:57.79 3.0 undecidable manual Sg 5.55 0
IV.VCRE.HHZ. 2021-09-27T19:34:46.80 3.0 undecidable manual Sn -7.52 0
IV.VCRE.HHZ. 2021-09-27T19:34:29.38 3.0 undecidable manual Pg 1.48 0
IV.POFI.HHZ. 2021-09-27T19:34:24.46 3.0 undecidable manual Sn -4.71 0
IV.TREM.HHZ. 2021-09-27T19:34:19.86 3.0 positive manual Pn -3.9 0
IV.MMO1.HNZ. 2021-09-27T19:34:13.63 0.6 undecidable manual S 172 42.8238 105 0.06 47
IV.MF5.EHZ. 2021-09-27T19:34:13.13 0.6 undecidable manual S 153 36.6411 108 1.13 33
IV.MC2.EHZ. 2021-09-27T19:34:13.45 0.6 undecidable manual S 187 41.3253 106 0.26 46
IV.RMP.HHZ. 2021-09-27T19:34:12.17 3.0 positive manual P 0.11 0
IV.FDMO.HHZ. 2021-09-27T19:34:10.22 0.6 undecidable manual S 206 30.2475 113 -0.17 47
IV.MML1.EHZ. 2021-09-27T19:34:10.43 0.6 undecidable manual S 231 29.3484 114 0.26 47
IV.SNTG.HHE. 2021-09-27T19:34:09.31 0.6 undecidable manual S 263 25.2525 118 0.11 49
IV.GUMA.HNN. 2021-09-27T19:34:09.07 0.6 undecidable manual S 164 25.1526 119 -0.11 49
IV.CSP1.EHZ. 2021-09-27T19:34:08.42 0.6 undecidable manual S 190 21.3675 124 0.12 48
IV.MC2.EHZ. 2021-09-27T19:34:07.48 0.3 undecidable manual P 187 41.3253 106 0.12 70
IV.MMO1.HNZ. 2021-09-27T19:34:07.69 0.3 undecidable manual P 172 42.8238 105 0.11 70
IV.PF6.EHZ. 2021-09-27T19:34:07.23 0.6 undecidable manual S 196 16.5723 133 -0.08 49
IV.EL6.EHZ. 2021-09-27T19:34:07.07 0.6 undecidable manual S 294 13.1757 140 0.39 47
IV.CING.HNE. 2021-09-27T19:34:06.56 0.6 undecidable manual S 337 11.3775 145 0.18 49
IV.MF5.EHZ. 2021-09-27T19:34:06.91 0.3 undecidable manual P 153 36.6411 108 0.24 69
IV.FDMO.HHZ. 2021-09-27T19:34:05.33 0.3 undecidable manual P 206 30.2475 113 -0.41 67
IV.MML1.EHZ. 2021-09-27T19:34:05.39 0.3 undecidable manual P 231 29.3484 114 -0.22 70
IV.SNTG.HHE. 2021-09-27T19:34:05.04 0.3 undecidable manual P 263 25.2525 118 -0.02 73
IV.CSP1.EHZ. 2021-09-27T19:34:04.26 0.1 undecidable manual P 190 21.3675 124 -0.28 94
IV.GUMA.HNN. 2021-09-27T19:34:04.97 0.1 undecidable manual P 164 25.1526 119 -0.07 98
IV.PF6.EHZ. 2021-09-27T19:34:03.58 0.1 undecidable manual P 196 16.5723 133 -0.38 93
IV.EL6.EHZ. 2021-09-27T19:34:03.66 0.3 undecidable manual P 294 13.1757 140 0.06 100
IV.CING.HNE. 2021-09-27T19:34:03.34 0.1 undecidable manual P 337 11.3775 145 -0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.1 0.000030350000000000002 0.52 AML other m 2021-09-27T19:34:03.59
IV.NRCA.HHN. ML:1.0 0.00002295 0.5 AML other m 2021-09-27T19:34:03.65
IV.FDMO.HHE. ML:0.9 0.000032 0.14 AML other m 2021-09-27T19:34:10.50
IV.FDMO.HHN. ML:0.8 0.000025849999999999998 0.18 AML other m 2021-09-27T19:34:10.50
IV.MML1.EHN. ML:0.7 0.0000202 1.08 AML other m 2021-09-27T19:34:10.61
IV.MML1.EHE. ML:0.8 0.000025149999999999998 0.24 AML other m 2021-09-27T19:34:10.53
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