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.

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
Colmurano MC 16 1263 70124
Gagliole MC 16 620 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
Filottrano AN 19 9499 146844
Cessapalombo MC 19 512 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

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
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 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.ESCV.HHZ. 2021-09-27T19:35:12.06 3.0 negative manual Pn 3.03 0
IV.SELL.HHZ. 2021-09-27T19:35:12.03 3.0 undecidable manual Pg 10.68 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.MC2.EHZ. 2021-09-27T19:34:13.45 0.6 undecidable manual S 187 0.3723 106 0.26 46
IV.MMO1.HNZ. 2021-09-27T19:34:13.63 0.6 undecidable manual S 172 0.3858 105 0.06 47
IV.MF5.EHZ. 2021-09-27T19:34:13.13 0.6 undecidable manual S 153 0.3301 108 1.13 33
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 0.2725 113 -0.17 47
IV.MML1.EHZ. 2021-09-27T19:34:10.43 0.6 undecidable manual S 231 0.2644 114 0.26 47
IV.SNTG.HHE. 2021-09-27T19:34:09.31 0.6 undecidable manual S 263 0.2275 118 0.11 49
IV.GUMA.HNN. 2021-09-27T19:34:09.07 0.6 undecidable manual S 164 0.2266 119 -0.11 49
IV.CSP1.EHZ. 2021-09-27T19:34:08.42 0.6 undecidable manual S 190 0.1925 124 0.12 48
IV.PF6.EHZ. 2021-09-27T19:34:07.23 0.6 undecidable manual S 196 0.1493 133 -0.08 49
IV.EL6.EHZ. 2021-09-27T19:34:07.07 0.6 undecidable manual S 294 0.1187 140 0.39 47
IV.MC2.EHZ. 2021-09-27T19:34:07.48 0.3 undecidable manual P 187 0.3723 106 0.12 70
IV.MMO1.HNZ. 2021-09-27T19:34:07.69 0.3 undecidable manual P 172 0.3858 105 0.11 70
IV.MF5.EHZ. 2021-09-27T19:34:06.91 0.3 undecidable manual P 153 0.3301 108 0.24 69
IV.CING.HNE. 2021-09-27T19:34:06.56 0.6 undecidable manual S 337 0.1025 145 0.18 49
IV.SNTG.HHE. 2021-09-27T19:34:05.04 0.3 undecidable manual P 263 0.2275 118 -0.02 73
IV.FDMO.HHZ. 2021-09-27T19:34:05.33 0.3 undecidable manual P 206 0.2725 113 -0.41 67
IV.MML1.EHZ. 2021-09-27T19:34:05.39 0.3 undecidable manual P 231 0.2644 114 -0.22 70
IV.GUMA.HNN. 2021-09-27T19:34:04.97 0.1 undecidable manual P 164 0.2266 119 -0.07 98
IV.CSP1.EHZ. 2021-09-27T19:34:04.26 0.1 undecidable manual P 190 0.1925 124 -0.28 94
IV.CING.HNE. 2021-09-27T19:34:03.34 0.1 undecidable manual P 337 0.1025 145 -0.08 99
IV.PF6.EHZ. 2021-09-27T19:34:03.58 0.1 undecidable manual P 196 0.1493 133 -0.38 93
IV.EL6.EHZ. 2021-09-27T19:34:03.66 0.1 undecidable manual P 294 0.1187 140 0.06 100
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
IV.ZEN8.EHN. ML:2.7 0.000048100000000000004 0.44 AML other m 2021-09-27T19:35:25.03
IV.ZEN8.EHE. ML:2.7 0.0000455 0.74 AML other m 2021-09-27T19:35:25.65
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download