Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.4 on date 20-02-2004 and time 01:34:24 (UTC) in region 3 km NE Gualdo (MC)

A magnitude Md 3.4 earthquake occured in region: 3 km NE Gualdo (MC), on

  • 20-02-2004 01:34:24 (UTC)
  • 20-02-2004 02:34:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0850, 13.3610 at 4 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
Gualdo MC 3 815 815
Sant'Angelo in Pontano MC 3 1436 2251
San Ginesio MC 4 3498 5749
Penna San Giovanni MC 6 1108 6857
Ripe San Ginesio MC 7 852 7709
Sarnano MC 7 3264 10973
Monte San Martino MC 9 765 11738
Cessapalombo MC 9 512 12250
Colmurano MC 9 1263 13513
Camporotondo di Fiastrone MC 9 563 14076
Falerone FM 10 3337 17413
Loro Piceno MC 10 2401 19814
Montappone FM 11 1682 21496
Servigliano FM 11 2336 23832
Monte Vidon Corrado FM 11 731 24563
Smerillo FM 11 365 24928
Amandola FM 12 3629 28557
Massa Fermana FM 12 963 29520
Caldarola MC 12 1823 31343
Urbisaglia MC 13 2628 33971
Santa Vittoria in Matenano FM 13 1330 35301
Belforte del Chienti MC 13 1886 37187
Montefalcone Appennino FM 13 424 37611
Monteleone di Fermo FM 14 395 38006
Belmonte Piceno FM 15 646 38652
Bolognola MC 15 142 38794
Comunanza AP 15 3166 41960
Mogliano MC 15 4696 46656
Tolentino MC 15 20069 66725
Montegiorgio FM 15 6851 73576
Montefortino FM 16 1178 74754
Monsampietro Morico FM 16 659 75413
Montelparo FM 16 778 76191
Acquacanina MC 16 121 76312
Force AP 17 1354 77666
Serrapetrona MC 17 966 78632
Fiastra MC 17 559 79191
Petriolo MC 18 1998 81189
Montottone FM 18 979 82168
Francavilla d'Ete FM 19 964 83132
Monte Rinaldo FM 19 379 83511
Magliano di Tenna FM 19 1452 84963
Grottazzolina FM 20 3398 88361

Municipalities with at least 50000 inhabitants

An earthquake occurred to
55 Km NW of Teramo (54892 inhabitants)
55 Km E of Foligno (57155 inhabitants)
61 Km S of Ancona (100861 inhabitants)
79 Km E of Perugia (166134 inhabitants)
82 Km N of L'Aquila (69753 inhabitants)
82 Km NE of Terni (111501 inhabitants)
89 Km SE of Fano (60888 inhabitants)
90 Km NW of Montesilvano (53738 inhabitants)
98 Km NW of Pescara (121014 inhabitants)
99 Km SE of Pesaro (94582 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 		Md 3.4
MLNET 3.7 		2004-02-20
01:34:24		 43.085 13.361 4 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 493679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2004-02-20 01:34:24 ± 0.372
Latitude 43.0850 ± 0.0104
Longitude 13.3610 ± 0.0256
Depth (km) 4 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 493679

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2379.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 152
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00275
Epicentral distance of station farthest from the epicenter (degree) 0.01943
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 32
Magnitudes information

Md:3.4

Field Value
Value 3.4
Uncertainty
Num. used stations 10
Type of magnitude Md
Reference to an origin 493679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 00:51:22

ML:3.7

Field Value
Value 3.7
Uncertainty
Num. used stations
Type of magnitude ML
Reference to an origin 493679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 10:38:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.RGNG.Z. 2004-02-20T01:34:59.97 10.0 undecidable manual PN 129 2.1534 -0.92 0.5
--.RFI.Z. 2004-02-20T01:34:58.00 10.0 undecidable manual PN 165 1.8315 1.53 0.2
--.PESA.N. 2004-02-20T01:34:57.78 10.0 undecidable manual SG 336 0.9213 0.51 0.5
--.FG2.Z. 2004-02-20T01:34:57.33 10.0 undecidable manual PN 133 1.8315 0.85 0.7
--.SGG.Z. 2004-02-20T01:34:57.88 10.0 undecidable manual PN 155 1.8537 1.21 0.4
--.SEI.Z. 2004-02-20T01:34:56.72 10.0 undecidable manual PN 304 1.7316 1.6 0.2
--.MNS.N. 2004-02-20T01:34:56.15 10.0 undecidable manual SG 215 0.8547 1.29 0.2
--.GRFL.Z. 2004-02-20T01:34:54.95 10.0 undecidable manual PN 272 1.7316 -0.14 1.1
--.VMG.Z. 2004-02-20T01:34:54.20 10.0 undecidable manual PN 304 1.5762 1.31 0.4
--.CII.Z. 2004-02-20T01:34:53.17 10.0 undecidable manual PN 152 1.5318 1 0.6
--.GIUL.Z. 2004-02-20T01:34:53.13 10.0 undecidable manual PN 182 1.5207 0.98 0.6
--.LAV9.Z. 2004-02-20T01:34:53.31 10.0 undecidable manual PN 199 1.4874 1.69 0.2
--.TOLF.Z. 2004-02-20T01:34:50.50 10.0 undecidable manual PN 224 1.4319 -0.31 1.2
--.MA9.Z. 2004-02-20T01:34:50.86 10.0 undecidable manual PN 201 1.4097 0.29 1.2
--.FSSB.E. 2004-02-20T01:34:50.31 10.0 undecidable manual SG 325 0.7326 -0.71 0.4
--.SDI.Z. 2004-02-20T01:34:50.62 10.0 undecidable manual PN 166 1.4097 0.03 1.3
--.PGD.Z. 2004-02-20T01:34:50.98 10.0 undecidable manual PN 304 1.4208 0.21 1.2
--.SFI.Z. 2004-02-20T01:34:49.88 10.0 undecidable manual PN 307 1.3653 -0.09 1.3
--.MURB.N. 2004-02-20T01:34:47.97 10.0 undecidable manual SG 286 0.6327 0.32 0.6
--.CERT.Z. 2004-02-20T01:34:47.65 10.0 undecidable manual PN 193 1.1655 0.42 1.2
--.MTCE.Z. 2004-02-20T01:34:46.75 10.0 undecidable manual PN 203 1.1544 -0.3 1.3
--.INTR.Z. 2004-02-20T01:34:46.40 10.0 undecidable manual PN 159 1.1433 -0.85 0.9
--.RSM.Z. 2004-02-20T01:34:46.36 10.0 undecidable manual PG 322 1.0656 0.59 1.2
--.CRE.Z. 2004-02-20T01:34:46.15 10.0 undecidable manual PN 297 1.1544 -0.9 0.8
--.PTQR.Z. 2004-02-20T01:34:44.10 10.0 undecidable manual PG 178 1.0656 -1.53 0.3
--.TERO.N. 2004-02-20T01:34:43.27 10.0 undecidable manual SG 158 0.4995 0.12 0.6
--.PESA.Z. 2004-02-20T01:34:42.97 10.0 undecidable manual PG 336 0.9213 -0.29 1.4
--.MNS.Z. 2004-02-20T01:34:40.91 10.0 positive manual PG 215 0.8547 -0.96 1.6
--.AQU.Z. 2004-02-20T01:34:38.27 10.0 positive manual PG 177 0.7326 -1.21 1.1
--.SNTG.Z. 2004-02-20T01:34:38.50 10.0 undecidable manual SG 298 0.3441 0.83 0.4
--.FSSB.Z. 2004-02-20T01:34:38.75 10.0 negative manual PG 325 0.7326 -0.9 1.7
--.MURB.Z. 2004-02-20T01:34:37.11 10.0 negative manual PG 286 0.6327 -0.59 1.3
--.CING.N. 2004-02-20T01:34:36.91 10.0 undecidable manual SG 337 0.3108 0.63 0.5
--.NRCA.Z. 2004-02-20T01:34:36.24 10.0 undecidable manual SG 215 0.3108 0.11 0.6
--.ASS.Z. 2004-02-20T01:34:34.98 10.0 negative manual PG 267 0.5106 -0.55 2.4
--.TERO.Z. 2004-02-20T01:34:34.29 10.0 undecidable manual PG 158 0.4995 -0.81 0.9
--.ARV.Z. 2004-02-20T01:34:34.75 10.0 negative manual PG 323 0.5106 -0.69 2.1
--.SNTG.Z. 2004-02-20T01:34:32.20 10.0 negative manual PG 298 0.3441 0.26 2.8
--.NRCA.Z. 2004-02-20T01:34:31.76 10.0 positive manual PG 215 0.3108 0.71 2.1
--.CING.Z. 2004-02-20T01:34:31.61 10.0 undecidable manual PG 337 0.3108 0.47 1.3
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, /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